diff --git a/src/widgets/kpropertiesdialog.cpp b/src/widgets/kpropertiesdialog.cpp
--- a/src/widgets/kpropertiesdialog.cpp
+++ b/src/widgets/kpropertiesdialog.cpp
@@ -1885,9 +1885,9 @@
 
     /*** Set Group ***/
 
-    QStringList groupList;
     KUser user(KUser::UseEffectiveUID);
-    const bool isMyGroup = user.groupNames().contains(d->strGroup);
+    QStringList groupList = user.groupNames();
+    const bool isMyGroup = groupList.contains(d->strGroup);
 
     /* add the group the file currently belongs to ..
     * .. if it is not there already