diff --git a/asmodee.py b/asmodee.py
index 0e37492..02b9b32 100755
--- a/asmodee.py
+++ b/asmodee.py
@@ -1534,6 +1534,7 @@ def bienvenue(event): # Affichage d'un message d'accueil aux nouveaux venus
 		modules[room.room_id, 'welcome'] = False
 	if (modules[room.room_id, 'welcome'] and not event['sender'] == bot.client.user_id):
 		membership = event['content']['membership']
+		prev_member = event.get('content', {}).get('unsigned',{}).get('prev_content',{}).get('membership', None)
 		nick = getNick(room,event)
 		alias = ""
 		if (len(room.aliases) > 0):
@@ -1544,7 +1545,7 @@ def bienvenue(event): # Affichage d'un message d'accueil aux nouveaux venus
 			reponse = welcome[room.room_id]
 		except:
 			reponse = ""
-		if (membership == "join"):
+		if (membership == "join" and prev_member != "join"):
 			msg(room,"Bienvenue sur " + alias + ", " + nick + ". " + reponse)
 
 def modo(room,event): # Definition d'un moderateur