diff --git a/gui/projectfiledialog.cpp b/gui/projectfiledialog.cpp
index 47e6c3965..b3e8624a3 100644
--- a/gui/projectfiledialog.cpp
+++ b/gui/projectfiledialog.cpp
@@ -434,7 +434,7 @@ void ProjectFileDialog::saveToProjectFile(ProjectFile *projectFile) const
         projectFile->setPlatform(mUI->mComboBoxPlatform->currentText());
     else {
         const int i = mUI->mComboBoxPlatform->currentIndex();
-        if (i < numberOfBuiltinPlatforms)
+        if (i>=0 && i < numberOfBuiltinPlatforms)
             projectFile->setPlatform(cppcheck::Platform::toString(builtinPlatforms[i]));
         else
             projectFile->setPlatform(QString());