diff --git a/private/extender_p.h b/private/extender_p.h
index d697cc0fb..02a85d3de 100644
--- a/private/extender_p.h
+++ b/private/extender_p.h
@@ -53,7 +53,6 @@ class ExtenderPrivate
         void updateBorders();
         void updateEmptyExtenderLabel();
         ExtenderGroup *findGroup(const QString &name) const;
-        bool isEmpty() const;
 
         Extender *q;