diff --git a/gajim/common/caps_cache.py b/gajim/common/caps_cache.py
index f3f2fffc0..0e2cba222 100644
--- a/gajim/common/caps_cache.py
+++ b/gajim/common/caps_cache.py
@@ -485,7 +485,7 @@ class MucCapsCache:
 
     def is_subject_change_allowed(self, jid, affiliation):
         allowed = True
-        if affiliation in ('owner, admin'):
+        if affiliation in ('owner', 'admin'):
             return allowed
 
         if jid in self.cache: