diff --git a/tools/test-networkmanager-service.py b/tools/test-networkmanager-service.py
index 1f623f691..1eb82e8ad 100755
--- a/tools/test-networkmanager-service.py
+++ b/tools/test-networkmanager-service.py
@@ -432,6 +432,8 @@ class ExportedObj(dbus.service.Object):
             if not permission_granted:
                 raise TestError("Cannot set property '%s' on '%s' on '%s' via D-Bus" % (propname, dbus_iface, self.path))
 
+            return
+
         assert propname in props
 
         props[propname] = value