diff --git a/src/plugins/cppeditor/cppincludehierarchymodel.h b/src/plugins/cppeditor/cppincludehierarchymodel.h
index 90d26856346a8c8398bfc0b06de3d80b70e6ef06..cc9cbef050d899849cfd37761e9e765747b83bff 100644
--- a/src/plugins/cppeditor/cppincludehierarchymodel.h
+++ b/src/plugins/cppeditor/cppincludehierarchymodel.h
@@ -48,6 +48,7 @@ class CppIncludeHierarchyItem;
 
 class CppIncludeHierarchyModel : public QAbstractItemModel
 {
+    Q_OBJECT
 public:
     explicit CppIncludeHierarchyModel(QObject *parent);
     ~CppIncludeHierarchyModel();