diff --git a/gajim/common/connection_handlers_events.py b/gajim/common/connection_handlers_events.py
index 155a5b06a..8fd1ff72b 100644
--- a/gajim/common/connection_handlers_events.py
+++ b/gajim/common/connection_handlers_events.py
@@ -800,7 +800,7 @@ PresenceHelperEvent):
         xtags = self.stanza.getTags('x')
         for x in xtags:
             namespace = x.getNamespace()
-            if namespace.startswith(nbxmpp.NS_MUC):
+            if namespace == nbxmpp.NS_MUC_USER:
                 self.is_gc = True
             elif namespace == nbxmpp.NS_SIGNED:
                 sig_tag = x