diff --git a/src/plugins/qmldesigner/designercore/model/documentmessage.cpp b/src/plugins/qmldesigner/designercore/model/documentmessage.cpp
index 9167ca1fdfc..a92c0d4b19e 100644
--- a/src/plugins/qmldesigner/designercore/model/documentmessage.cpp
+++ b/src/plugins/qmldesigner/designercore/model/documentmessage.cpp
@@ -73,7 +73,7 @@ QString DocumentMessage::toString() const
     }
 
     if (!str.isEmpty())
-        QStringLiteral(": ");
+        str += QStringLiteral(": ");
     str += description();
 
     return str;