diff --git a/gui/checkthread.cpp b/gui/checkthread.cpp
index e22709ee7..d5c0635c5 100644
--- a/gui/checkthread.cpp
+++ b/gui/checkthread.cpp
@@ -127,6 +127,9 @@ void CheckThread::runAddonsAndTools(const ImportProject::FileSettings *fileSetti
             foreach (QString D, QString::fromStdString(fileSettings->defines).split(";")) {
                 args << ("-D" + D);
             }
+            foreach (const std::string& U, fileSettings->undefs) {
+                args << QString::fromStdString("-U" + U);
+            }
 
             const QString clangPath = CheckThread::clangTidyCmd();
             if (!clangPath.isEmpty()) {
diff --git a/gui/cppchecklibrarydata.cpp b/gui/cppchecklibrarydata.cpp
index 4f02bace2..5208c4b91 100644
--- a/gui/cppchecklibrarydata.cpp
+++ b/gui/cppchecklibrarydata.cpp
@@ -91,6 +91,11 @@ static CppcheckLibraryData::Define loadDefine(const QXmlStreamReader &xmlReader)
     return define;
 }
 
+static QString loadUndefine(const QXmlStreamReader &xmlReader)
+{
+    return xmlReader.attributes().value("name").toString();
+}
+
 static CppcheckLibraryData::Function::Arg loadFunctionArg(QXmlStreamReader &xmlReader)
 {
     CppcheckLibraryData::Function::Arg arg;
@@ -237,6 +242,8 @@ QString CppcheckLibraryData::open(QIODevice &file)
                     containers.append(loadContainer(xmlReader));
                 else if (elementName == "define")
                     defines.append(loadDefine(xmlReader));
+                else if (elementName == "undefine")
+                    undefines.append(loadUndefine(xmlReader));
                 else if (elementName == "function")
                     functions.append(loadFunction(xmlReader, comments));
                 else if (elementName == "memory" || elementName == "resource")
@@ -459,6 +466,12 @@ QString CppcheckLibraryData::toString() const
         xmlWriter.writeEndElement();
     }
 
+    foreach (const QString &undef, undefines) {
+        xmlWriter.writeStartElement("undefine");
+        xmlWriter.writeAttribute("name", undef);
+        xmlWriter.writeEndElement();
+    }
+
     foreach (const Function &function, functions) {
         writeFunction(xmlWriter, function);
     }
diff --git a/gui/cppchecklibrarydata.h b/gui/cppchecklibrarydata.h
index 6b0be5714..1792ce72d 100644
--- a/gui/cppchecklibrarydata.h
+++ b/gui/cppchecklibrarydata.h
@@ -154,6 +154,7 @@ public:
     void clear() {
         containers.clear();
         defines.clear();
+        undefines.clear();
         functions.clear();
         memoryresource.clear();
         podtypes.clear();
@@ -163,6 +164,7 @@ public:
     void swap(CppcheckLibraryData &other) {
         containers.swap(other.containers);
         defines.swap(other.defines);
+        undefines.swap(other.undefines);
         functions.swap(other.functions);
         memoryresource.swap(other.memoryresource);
         podtypes.swap(other.podtypes);
@@ -176,6 +178,7 @@ public:
     QList<struct Function> functions;
     QList<struct MemoryResource> memoryresource;
     QList<struct PodType> podtypes;
+    QStringList undefines;
 };
 
 #endif // LIBRARYDATA_H
diff --git a/gui/mainwindow.cpp b/gui/mainwindow.cpp
index 537a0a8f7..9f60593e1 100644
--- a/gui/mainwindow.cpp
+++ b/gui/mainwindow.cpp
@@ -838,6 +838,10 @@ Settings MainWindow::getCppcheckSettings()
             result.userDefines += define.toStdString();
         }
 
+        const QStringList undefines = mProjectFile->getUndefines();
+        foreach (QString undefine, undefines)
+            result.userUndefs.insert(undefine.toStdString());
+
         const QStringList libraries = mProjectFile->getLibraries();
         foreach (QString library, libraries) {
             const QString filename = library + ".cfg";
diff --git a/gui/projectfile.cpp b/gui/projectfile.cpp
index 04c32f7cd..922001bf7 100644
--- a/gui/projectfile.cpp
+++ b/gui/projectfile.cpp
@@ -37,6 +37,8 @@ static const char DirNameAttrib[] = "name";
 static const char DefinesElementName[] = "defines";
 static const char DefineName[] = "define";
 static const char DefineNameAttrib[] = "name";
+static const char UndefinesElementName[] = "undefines";
+static const char UndefineName[] = "undefine";
 static const char PathsElementName[] = "paths";
 static const char PathName[] = "dir";
 static const char PathNameAttrib[] = "name";
@@ -82,6 +84,7 @@ void ProjectFile::clear()
     mAnalyzeAllVsConfigs = true;
     mIncludeDirs.clear();
     mDefines.clear();
+    mUndefines.clear();
     mPaths.clear();
     mExcludedPaths.clear();
     mLibraries.clear();
@@ -138,6 +141,10 @@ bool ProjectFile::read(const QString &filename)
             if (insideProject && xmlReader.name() == DefinesElementName)
                 readDefines(xmlReader);
 
+            // Find preprocessor define from inside project element
+            if (insideProject && xmlReader.name() == UndefinesElementName)
+                readStringList(mUndefines, xmlReader, UndefineName);
+
             // Find exclude list from inside project element
             if (insideProject && xmlReader.name() == ExcludeElementName)
                 readExcludes(xmlReader);
@@ -557,6 +564,11 @@ void ProjectFile::setDefines(const QStringList &defines)
     mDefines = defines;
 }
 
+void ProjectFile::setUndefines(const QStringList &undefines)
+{
+    mUndefines = undefines;
+}
+
 void ProjectFile::setCheckPaths(const QStringList &paths)
 {
     mPaths = paths;
@@ -650,6 +662,11 @@ bool ProjectFile::write(const QString &filename)
         xmlWriter.writeEndElement();
     }
 
+    writeStringList(xmlWriter,
+                    mUndefines,
+                    UndefinesElementName,
+                    UndefineName);
+
     if (!mPaths.isEmpty()) {
         xmlWriter.writeStartElement(PathsElementName);
         foreach (QString path, mPaths) {
diff --git a/gui/projectfile.h b/gui/projectfile.h
index c31e93d24..d8a39406f 100644
--- a/gui/projectfile.h
+++ b/gui/projectfile.h
@@ -84,6 +84,14 @@ public:
         return mDefines;
     }
 
+    /**
+    * @brief Get list of undefines.
+    * @return list of undefines.
+    */
+    QStringList getUndefines() const {
+        return mUndefines;
+    }
+
     /**
     * @brief Get list of paths to check.
     * @return list of paths.
@@ -198,6 +206,12 @@ public:
      */
     void setDefines(const QStringList &defines);
 
+    /**
+     * @brief Set list of undefines.
+     * @param defines List of undefines.
+     */
+    void setUndefines(const QStringList &undefines);
+
     /**
      * @brief Set list of paths to check.
      * @param paths List of paths.
@@ -372,6 +386,11 @@ private:
      */
     QStringList mDefines;
 
+    /**
+     * @brief List of undefines.
+     */
+    QStringList mUndefines;
+
     /**
      * @brief List of paths to check.
      */
diff --git a/gui/projectfiledialog.cpp b/gui/projectfiledialog.cpp
index 90a1d8a83..a49c84d69 100644
--- a/gui/projectfiledialog.cpp
+++ b/gui/projectfiledialog.cpp
@@ -134,6 +134,9 @@ ProjectFileDialog::ProjectFileDialog(ProjectFile *projectFile, QWidget *parent)
 
     mUI.mEditTags->setValidator(new QRegExpValidator(QRegExp("[a-zA-Z0-9 ;]*"),this));
 
+    const QRegExp undefRegExp("\\s*([a-zA-Z_][a-zA-Z0-9_]*[; ]*)*");
+    mUI.mEditUndefines->setValidator(new QRegExpValidator(undefRegExp, this));
+
     connect(mUI.mButtons, &QDialogButtonBox::accepted, this, &ProjectFileDialog::ok);
     connect(mUI.mBtnBrowseBuildDir, &QPushButton::clicked, this, &ProjectFileDialog::browseBuildDir);
     connect(mUI.mBtnClearImportProject, &QPushButton::clicked, this, &ProjectFileDialog::clearImportProject);
@@ -192,6 +195,7 @@ void ProjectFileDialog::loadFromProjectFile(const ProjectFile *projectFile)
     setBuildDir(projectFile->getBuildDir());
     setIncludepaths(projectFile->getIncludeDirs());
     setDefines(projectFile->getDefines());
+    setUndefines(projectFile->getUndefines());
     setCheckPaths(projectFile->getCheckPaths());
     setImportProject(projectFile->getImportProject());
     mUI.mChkAllVsConfigs->setChecked(projectFile->getAnalyzeAllVsConfigs());
@@ -268,6 +272,7 @@ void ProjectFileDialog::saveToProjectFile(ProjectFile *projectFile) const
     projectFile->setAnalyzeAllVsConfigs(mUI.mChkAllVsConfigs->isChecked());
     projectFile->setIncludes(getIncludePaths());
     projectFile->setDefines(getDefines());
+    projectFile->setUndefines(getUndefines());
     projectFile->setCheckPaths(getCheckPaths());
     projectFile->setExcludedPaths(getExcludedPaths());
     projectFile->setLibraries(getLibraries());
@@ -348,6 +353,7 @@ void ProjectFileDialog::updatePathsAndDefines()
     mUI.mBtnEditCheckPath->setEnabled(!importProject);
     mUI.mBtnRemoveCheckPath->setEnabled(!importProject);
     mUI.mEditDefines->setEnabled(!importProject);
+    mUI.mEditUndefines->setEnabled(!importProject);
     mUI.mBtnAddInclude->setEnabled(!importProject);
     mUI.mBtnEditInclude->setEnabled(!importProject);
     mUI.mBtnRemoveInclude->setEnabled(!importProject);
@@ -456,6 +462,14 @@ QStringList ProjectFileDialog::getDefines() const
     return defines;
 }
 
+QStringList ProjectFileDialog::getUndefines() const
+{
+    const QString undefine = mUI.mEditUndefines->text().trimmed();
+    QStringList undefines = undefine.split(QRegExp("\\s*;\\s*"), QString::SkipEmptyParts);
+    undefines.removeDuplicates();
+    return undefines;
+}
+
 QStringList ProjectFileDialog::getCheckPaths() const
 {
     const int count = mUI.mListCheckPaths->count();
@@ -524,6 +538,11 @@ void ProjectFileDialog::setDefines(const QStringList &defines)
     mUI.mEditDefines->setText(definestr);
 }
 
+void ProjectFileDialog::setUndefines(const QStringList &undefines)
+{
+    mUI.mEditUndefines->setText(undefines.join(";"));
+}
+
 void ProjectFileDialog::setCheckPaths(const QStringList &paths)
 {
     foreach (QString path, paths) {
diff --git a/gui/projectfiledialog.h b/gui/projectfiledialog.h
index 8870efe06..8ce0982f9 100644
--- a/gui/projectfiledialog.h
+++ b/gui/projectfiledialog.h
@@ -75,6 +75,12 @@ private:
     */
     QStringList getDefines() const;
 
+    /**
+    * @brief Return undefine names from the dialog control.
+    * @return List of undefine names.
+    */
+    QStringList getUndefines() const;
+
     /**
     * @brief Return check paths from the dialog control.
     * @return List of check paths.
@@ -124,6 +130,12 @@ private:
     */
     void setDefines(const QStringList &defines);
 
+    /**
+    * @brief Set undefine names to dialog control.
+    * @param defines List of undefine names to set to dialog control.
+    */
+    void setUndefines(const QStringList &defines);
+
     /**
     * @brief Set check paths to dialog control.
     * @param paths List of path names to set to dialog control.
diff --git a/gui/projectfiledialog.ui b/gui/projectfiledialog.ui
index 530155444..606b01718 100644
--- a/gui/projectfiledialog.ui
+++ b/gui/projectfiledialog.ui
@@ -166,6 +166,27 @@
          </item>
         </layout>
        </item>
+       <item>
+        <layout class="QHBoxLayout" name="mLayoutUndefines">
+         <item>
+          <widget class="QLabel" name="mLabelUndefines">
+           <property name="text">
+            <string>Undefines:</string>
+           </property>
+           <property name="buddy">
+            <cstring>mEditUndefines</cstring>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QLineEdit" name="mEditUndefines">
+           <property name="toolTip">
+            <string>Undefines must be separated by a semicolon. Example: UNDEF1;UNDEF2;UNDEF3</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
        <item>
         <layout class="QHBoxLayout" name="mLayoutIncludePaths">
          <item>
diff --git a/gui/stats.ui b/gui/stats.ui
index 0c630abff..8147b8e7e 100644
--- a/gui/stats.ui
+++ b/gui/stats.ui
@@ -125,6 +125,26 @@
          </property>
         </widget>
        </item>
+       <item>
+        <widget class="QLabel" name="mUndefinesLabel">
+         <property name="text">
+          <string>Undefines:</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QLineEdit" name="mUndefines">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="readOnly">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
        <item>
         <spacer name="mVerticalSpacer">
          <property name="orientation">
diff --git a/gui/statsdialog.cpp b/gui/statsdialog.cpp
index 67da168f1..5e95b15eb 100644
--- a/gui/statsdialog.cpp
+++ b/gui/statsdialog.cpp
@@ -50,6 +50,7 @@ void StatsDialog::setProject(const ProjectFile* projectFile)
         mUI.mPaths->setText(projectFile->getCheckPaths().join(";"));
         mUI.mIncludePaths->setText(projectFile->getIncludeDirs().join(";"));
         mUI.mDefines->setText(projectFile->getDefines().join(";"));
+        mUI.mUndefines->setText(projectFile->getUndefines().join(";"));
 #ifndef HAVE_QCHART
         mUI.mTabHistory->setVisible(false);
 #else
@@ -81,6 +82,7 @@ void StatsDialog::setProject(const ProjectFile* projectFile)
         mUI.mPaths->setText(QString());
         mUI.mIncludePaths->setText(QString());
         mUI.mDefines->setText(QString());
+        mUI.mUndefines->setText(QString());
     }
 }
 
@@ -174,6 +176,7 @@ void StatsDialog::copyToClipboard()
     const QString paths(tr("Paths"));
     const QString incPaths(tr("Include paths"));
     const QString defines(tr("Defines"));
+    const QString undefines(tr("Undefines"));
     const QString prevScan(tr("Previous Scan"));
     const QString selPath(tr("Path selected"));
     const QString numFiles(tr("Number of files scanned"));
@@ -193,6 +196,7 @@ void StatsDialog::copyToClipboard()
                                  "\t%4:\t%5\n"
                                  "\t%6:\t%7\n"
                                  "\t%8:\t%9\n"
+                                 "\t%10:\t%11\n"
                              )
                              .arg(projSettings)
                              .arg(project)
@@ -202,7 +206,9 @@ void StatsDialog::copyToClipboard()
                              .arg(incPaths)
                              .arg(mUI.mIncludePaths->text())
                              .arg(defines)
-                             .arg(mUI.mDefines->text());
+                             .arg(mUI.mDefines->text())
+                             .arg(undefines)
+                             .arg(mUI.mUndefines->text());
 
     const QString previous = QString(
                                  "%1\n"
@@ -251,6 +257,7 @@ void StatsDialog::copyToClipboard()
                                      " <tr><th>%4:</th><td>%5</td></tr>\n"
                                      " <tr><th>%6:</th><td>%7</td></tr>\n"
                                      " <tr><th>%8:</th><td>%9</td></tr>\n"
+                                     " <tr><th>%10:</th><td>%11</td></tr>\n"
                                      "</table>\n"
                                  )
                                  .arg(projSettings)
@@ -261,7 +268,9 @@ void StatsDialog::copyToClipboard()
                                  .arg(incPaths)
                                  .arg(mUI.mIncludePaths->text())
                                  .arg(defines)
-                                 .arg(mUI.mDefines->text());
+                                 .arg(mUI.mDefines->text())
+                                 .arg(undefines)
+                                 .arg(mUI.mUndefines->text());
 
     const QString htmlPrevious = QString(
                                      "<h3>%1</h3>\n"
diff --git a/lib/cppcheck.cpp b/lib/cppcheck.cpp
index 9bf215177..d2fd333b1 100644
--- a/lib/cppcheck.cpp
+++ b/lib/cppcheck.cpp
@@ -97,7 +97,7 @@ unsigned int CppCheck::check(const ImportProject::FileSettings &fs)
         temp.mSettings.userDefines += ';';
     temp.mSettings.userDefines += fs.cppcheckDefines();
     temp.mSettings.includePaths = fs.includePaths;
-    // TODO: temp.mSettings.userUndefs = fs.undefs;
+    temp.mSettings.userUndefs = fs.undefs;
     if (fs.platformType != Settings::Unspecified) {
         temp.mSettings.platform(fs.platformType);
     }
@@ -123,7 +123,14 @@ unsigned int CppCheck::checkFile(const std::string& filename, const std::string
         mErrorLogger.reportOut(std::string("Checking ") + fixedpath + ' ' + cfgname + std::string("..."));
 
         if (mSettings.verbose) {
-            mErrorLogger.reportOut("Defines: " + mSettings.userDefines);
+            mErrorLogger.reportOut("Defines:" + mSettings.userDefines);
+            std::string undefs;
+            for (const std::string& U : mSettings.userUndefs) {
+                if (!undefs.empty())
+                    undefs += ';';
+                undefs += ' ' + U;
+            }
+            mErrorLogger.reportOut("Undefines:" + undefs);
             std::string includePaths;
             for (const std::string &I : mSettings.includePaths)
                 includePaths += " -I" + I;