diff --git a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarymodel.h b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarymodel.h
index bdbad139330..fc988966053 100644
--- a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarymodel.h
+++ b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarymodel.h
@@ -62,7 +62,7 @@ public:
 
     void setSearchText(const QString &searchText);
 
-    void setExpanded(bool, const QString &section);
+    Q_INVOKABLE void setExpanded(bool, const QString &section);
 
     void setFlowMode(bool);