diff --git a/Makefile b/Makefile
index 654d142ba..6f935dbef 100644
--- a/Makefile
+++ b/Makefile
@@ -332,7 +332,7 @@ validateXML: createXMLExamples
 $(SRCDIR)/analyzerinfo.o: lib/analyzerinfo.cpp lib/analyzerinfo.h lib/config.h lib/errorlogger.h lib/suppressions.h lib/importproject.h lib/platform.h lib/utils.h lib/path.h
 	$(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CFG) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o $(SRCDIR)/analyzerinfo.o $(SRCDIR)/analyzerinfo.cpp
 
-$(SRCDIR)/astutils.o: lib/astutils.cpp lib/astutils.h lib/library.h lib/config.h lib/errorlogger.h lib/suppressions.h lib/mathlib.h lib/standards.h lib/settings.h lib/importproject.h lib/platform.h lib/utils.h lib/timer.h lib/symboldatabase.h lib/token.h lib/valueflow.h
+$(SRCDIR)/astutils.o: lib/astutils.cpp lib/astutils.h lib/errorlogger.h lib/config.h lib/suppressions.h lib/library.h lib/mathlib.h lib/standards.h lib/settings.h lib/importproject.h lib/platform.h lib/utils.h lib/timer.h lib/symboldatabase.h lib/token.h lib/valueflow.h
 	$(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CFG) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o $(SRCDIR)/astutils.o $(SRCDIR)/astutils.cpp
 
 $(SRCDIR)/check.o: lib/check.cpp lib/check.h lib/config.h lib/errorlogger.h lib/suppressions.h lib/settings.h lib/importproject.h lib/platform.h lib/utils.h lib/library.h lib/mathlib.h lib/standards.h lib/timer.h lib/token.h lib/valueflow.h lib/tokenize.h lib/tokenlist.h
@@ -392,7 +392,7 @@ $(SRCDIR)/checkpostfixoperator.o: lib/checkpostfixoperator.cpp lib/checkpostfixo
 $(SRCDIR)/checksizeof.o: lib/checksizeof.cpp lib/checksizeof.h lib/check.h lib/config.h lib/errorlogger.h lib/suppressions.h lib/settings.h lib/importproject.h lib/platform.h lib/utils.h lib/library.h lib/mathlib.h lib/standards.h lib/timer.h lib/token.h lib/valueflow.h lib/tokenize.h lib/tokenlist.h lib/symboldatabase.h
 	$(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CFG) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o $(SRCDIR)/checksizeof.o $(SRCDIR)/checksizeof.cpp
 
-$(SRCDIR)/checkstl.o: lib/checkstl.cpp lib/checkstl.h lib/check.h lib/config.h lib/errorlogger.h lib/suppressions.h lib/settings.h lib/importproject.h lib/platform.h lib/utils.h lib/library.h lib/mathlib.h lib/standards.h lib/timer.h lib/token.h lib/valueflow.h lib/tokenize.h lib/tokenlist.h lib/checknullpointer.h lib/symboldatabase.h
+$(SRCDIR)/checkstl.o: lib/checkstl.cpp lib/checkstl.h lib/check.h lib/config.h lib/errorlogger.h lib/suppressions.h lib/settings.h lib/importproject.h lib/platform.h lib/utils.h lib/library.h lib/mathlib.h lib/standards.h lib/timer.h lib/token.h lib/valueflow.h lib/tokenize.h lib/tokenlist.h lib/checknullpointer.h lib/symboldatabase.h lib/astutils.h
 	$(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CFG) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o $(SRCDIR)/checkstl.o $(SRCDIR)/checkstl.cpp
 
 $(SRCDIR)/checkstring.o: lib/checkstring.cpp lib/checkstring.h lib/check.h lib/config.h lib/errorlogger.h lib/suppressions.h lib/settings.h lib/importproject.h lib/platform.h lib/utils.h lib/library.h lib/mathlib.h lib/standards.h lib/timer.h lib/token.h lib/valueflow.h lib/tokenize.h lib/tokenlist.h lib/astutils.h lib/symboldatabase.h
@@ -491,7 +491,7 @@ test/test64bit.o: test/test64bit.cpp lib/check64bit.h lib/check.h lib/config.h l
 test/testassert.o: test/testassert.cpp lib/checkassert.h lib/check.h lib/config.h lib/errorlogger.h lib/suppressions.h lib/settings.h lib/importproject.h lib/platform.h lib/utils.h lib/library.h lib/mathlib.h lib/standards.h lib/timer.h lib/token.h lib/valueflow.h lib/tokenize.h lib/tokenlist.h test/testsuite.h
 	$(CXX) ${INCLUDE_FOR_TEST} $(CPPFLAGS) $(CFG) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o test/testassert.o test/testassert.cpp
 
-test/testastutils.o: test/testastutils.cpp lib/astutils.h lib/settings.h lib/config.h lib/errorlogger.h lib/suppressions.h lib/importproject.h lib/platform.h lib/utils.h lib/library.h lib/mathlib.h lib/standards.h lib/timer.h test/testsuite.h lib/token.h lib/valueflow.h lib/tokenize.h lib/tokenlist.h
+test/testastutils.o: test/testastutils.cpp lib/astutils.h lib/errorlogger.h lib/config.h lib/suppressions.h lib/settings.h lib/importproject.h lib/platform.h lib/utils.h lib/library.h lib/mathlib.h lib/standards.h lib/timer.h test/testsuite.h lib/token.h lib/valueflow.h lib/tokenize.h lib/tokenlist.h
 	$(CXX) ${INCLUDE_FOR_TEST} $(CPPFLAGS) $(CFG) $(CXXFLAGS) $(UNDEF_STRICT_ANSI) -c -o test/testastutils.o test/testastutils.cpp
 
 test/testautovariables.o: test/testautovariables.cpp lib/checkautovariables.h lib/check.h lib/config.h lib/errorlogger.h lib/suppressions.h lib/settings.h lib/importproject.h lib/platform.h lib/utils.h lib/library.h lib/mathlib.h lib/standards.h lib/timer.h lib/token.h lib/valueflow.h lib/tokenize.h lib/tokenlist.h test/testsuite.h
diff --git a/gui/projectfiledialog.cpp b/gui/projectfiledialog.cpp
index 769023dbe..90a1d8a83 100644
--- a/gui/projectfiledialog.cpp
+++ b/gui/projectfiledialog.cpp
@@ -672,7 +672,7 @@ void ProjectFileDialog::editSuppression(const QModelIndex &)
     }
 }
 
-int ProjectFileDialog::getSuppressionIndex(const QString shortText) const
+int ProjectFileDialog::getSuppressionIndex(const QString &shortText) const
 {
     const std::string s = shortText.toStdString();
     for (int i = 0; i < mSuppressions.size(); ++i) {
diff --git a/gui/projectfiledialog.h b/gui/projectfiledialog.h
index d717ec39d..8870efe06 100644
--- a/gui/projectfiledialog.h
+++ b/gui/projectfiledialog.h
@@ -280,7 +280,7 @@ protected:
      * @param shortText text as generated by Suppression::getText
      * @return index of matching suppression, -1 if not found
      */
-    int getSuppressionIndex(const QString shortText) const;
+    int getSuppressionIndex(const QString &shortText) const;
 
 private:
     Ui::ProjectFile mUI;