diff --git a/src/plugins/cppeditor/cppeditorplugin.cpp b/src/plugins/cppeditor/cppeditorplugin.cpp
index 8784eaace48..669aa729e15 100644
--- a/src/plugins/cppeditor/cppeditorplugin.cpp
+++ b/src/plugins/cppeditor/cppeditorplugin.cpp
@@ -88,6 +88,7 @@ public:
         addMimeType(CppTools::Constants::CPP_SOURCE_MIMETYPE);
         addMimeType(CppTools::Constants::CPP_HEADER_MIMETYPE);
         addMimeType(CppTools::Constants::QDOC_MIMETYPE);
+        addMimeType(CppTools::Constants::MOC_MIMETYPE);
 
         setDocumentCreator([]() { return new CppEditorDocument; });
         setEditorWidgetCreator([]() { return new CppEditorWidget; });
diff --git a/src/plugins/cpptools/cppprojectfile.cpp b/src/plugins/cpptools/cppprojectfile.cpp
index 3495bfe27aa..63ac1e79c05 100644
--- a/src/plugins/cpptools/cppprojectfile.cpp
+++ b/src/plugins/cpptools/cppprojectfile.cpp
@@ -64,6 +64,10 @@ ProjectFile::Kind ProjectFile::classify(const QString &file)
         return ObjCSource;
     if (mt == QLatin1String(CppTools::Constants::OBJECTIVE_CPP_SOURCE_MIMETYPE))
         return ObjCXXSource;
+    if (mt == QLatin1String(CppTools::Constants::QDOC_MIMETYPE))
+        return CXXSource;
+    if (mt == QLatin1String(CppTools::Constants::MOC_MIMETYPE))
+        return CXXSource;
     return Unclassified;
 }
 
diff --git a/src/plugins/cpptools/cpptoolsconstants.h b/src/plugins/cpptools/cpptoolsconstants.h
index 5d2d06201c7..e2b63795d6a 100644
--- a/src/plugins/cpptools/cpptoolsconstants.h
+++ b/src/plugins/cpptools/cpptoolsconstants.h
@@ -43,6 +43,7 @@ const char OBJECTIVE_C_SOURCE_MIMETYPE[] = "text/x-objcsrc";
 const char OBJECTIVE_CPP_SOURCE_MIMETYPE[] = "text/x-objc++src";
 const char CPP_HEADER_MIMETYPE[] = "text/x-c++hdr";
 const char QDOC_MIMETYPE[] = "text/x-qdoc";
+const char MOC_MIMETYPE[] = "text/x-moc";
 
 // QSettings keys for use by the "New Class" wizards.
 const char CPPTOOLS_SETTINGSGROUP[] = "CppTools";