diff --git a/src/libs/ifc/ifcdef.h b/src/libs/ifc/ifcdef.h
index e5ae62094..a6a0df2ec 100644
--- a/src/libs/ifc/ifcdef.h
+++ b/src/libs/ifc/ifcdef.h
@@ -34,6 +34,7 @@
 #include <QtGlobal>
 
 #include "../vmisc/def.h"
+#include "../vmisc/diagnostic.h"
 
 extern const QString CustomMSign;
 extern const QString CustomIncrSign;