diff --git a/src/gajim.py b/src/gajim.py
index bdfea4db1..93feefe38 100755
--- a/src/gajim.py
+++ b/src/gajim.py
@@ -2775,7 +2775,7 @@ class Interface:
 			mc = mw.get_control(fjid, account)
 			mc.user_nick = gajim.nicks[account]
 
-	def on_open_chat_window(self, contact, account, resource = None, 
+	def on_open_chat_window(self, widget, contact, account, resource = None, 
 		session = None):
 		# Get the window containing the chat
 		fjid = contact.jid
diff --git a/src/roster_window.py b/src/roster_window.py
index e98c933f3..a782c5cb1 100644
--- a/src/roster_window.py
+++ b/src/roster_window.py
@@ -3347,7 +3347,7 @@ class RosterWindow:
 					gajim.contacts.get_contact_with_highest_priority(account, jid)
 			if jid == gajim.get_jid_from_account(account):
 				resource = contact.resource
-			gajim.interface.on_open_chat_window(contact, account, \
+			gajim.interface.on_open_chat_window(None, contact, account, \
 				resource = resource, session = session)
 
 	def on_roster_treeview_row_activated(self, widget, path, col = 0):