diff --git a/dataengine.cpp b/dataengine.cpp
index f8297747f..848702050 100644
--- a/dataengine.cpp
+++ b/dataengine.cpp
@@ -302,7 +302,7 @@ void DataEngine::removeAllSources()
     while (it.hasNext()) {
         it.next();
         Plasma::DataContainer *s = it.value();
-        const QString &source = it.key();
+        const QString source = it.key();
         it.remove();
         s->disconnect(this);
         s->deleteLater();