diff --git a/src/plugins/cpptools/clangdiagnosticconfig.h b/src/plugins/cpptools/clangdiagnosticconfig.h
index 55e66e67df0..2f4408ba2b0 100644
--- a/src/plugins/cpptools/clangdiagnosticconfig.h
+++ b/src/plugins/cpptools/clangdiagnosticconfig.h
@@ -30,6 +30,7 @@
 #include <utils/id.h>
 
 #include <QHash>
+#include <QMap>
 #include <QStringList>
 #include <QVector>