diff --git a/src/main/java/org/olat/instantMessaging/SmackInstantMessagingImpl.java b/src/main/java/org/olat/instantMessaging/SmackInstantMessagingImpl.java
index 1f31beff371db53f4caf46c84112f4f335392f79..9af6537f9a68c597a7393851f198e8a49da0b721 100644
--- a/src/main/java/org/olat/instantMessaging/SmackInstantMessagingImpl.java
+++ b/src/main/java/org/olat/instantMessaging/SmackInstantMessagingImpl.java
@@ -158,7 +158,7 @@ public class SmackInstantMessagingImpl extends LogDelegator implements InstantMe
 		
 		logDebug("Adding user to roster group::" + groupId + " username: " + addedUsername);
 		
-		return buddyGroupService.addUserToSharedGroup(groupId, addedUsername);
+		return buddyGroupService.addUserToSharedGroup(groupId, imUsername);
 	}
 
 	/**