diff --git a/lib/checkclass.h b/lib/checkclass.h
index 724607e0e..533fb4864 100644
--- a/lib/checkclass.h
+++ b/lib/checkclass.h
@@ -202,7 +202,7 @@ private:
         Type type;             // constructor, destructor, ...
     };
 
-    struct SpaceInfo;
+    class SpaceInfo;
 
     struct BaseInfo
     {