diff --git a/src/plugins/clangtools/virtualfilesystemoverlay.h b/src/plugins/clangtools/virtualfilesystemoverlay.h
index f6077f12a5d..9cc16c8f2c2 100644
--- a/src/plugins/clangtools/virtualfilesystemoverlay.h
+++ b/src/plugins/clangtools/virtualfilesystemoverlay.h
@@ -28,6 +28,8 @@
 #include <utils/fileutils.h>
 #include <utils/temporarydirectory.h>
 
+#include <QMap>
+
 namespace Core { class IDocument; }
 
 namespace ClangTools {