diff --git a/src/plugins/qmldesigner/libs/designercore/rewriter/texttomodelmerger.cpp b/src/plugins/qmldesigner/libs/designercore/rewriter/texttomodelmerger.cpp
index d30c4f07b0c..9d39d093f07 100644
--- a/src/plugins/qmldesigner/libs/designercore/rewriter/texttomodelmerger.cpp
+++ b/src/plugins/qmldesigner/libs/designercore/rewriter/texttomodelmerger.cpp
@@ -85,7 +85,7 @@ bool isGlobalQtEnums(QStringView value)
          u"TopToBottom",     u"UpArrowCursor",  u"Vertical",           u"WaitCursor",
          u"WhatsThisCursor", u"WheelFocus"});
 
-    if (value.toString().startsWith("Key_"))
+    if (value.startsWith(u"Key_"))
         return true;
 
     return std::binary_search(std::begin(list),