diff --git a/src/groupchat_control.py b/src/groupchat_control.py
index 7df365c724236caea8d1ebf69132a5df018aeb0b..ebd544c3f14477ae1f3768823010aa7c7c4fa0e7 100644
--- a/src/groupchat_control.py
+++ b/src/groupchat_control.py
@@ -1500,7 +1500,7 @@ class GroupchatControl(ChatControlBase):
 		'''revoke owner privilege to a user'''
 		gajim.connections[self.account].gc_set_affiliation(self.room_jid, jid, 'admin')
 
-	def on_info(self, widget, ck):
+	def on_info(self, widget, nick):
 		'''Call vcard_information_window class to display user's information'''
 		c = gajim.contacts.get_gc_contact(self.account, self.room_jid, nick)
  		c2 = gajim.contacts.contact_from_gc_contact(c)