diff --git a/src/ejabberd_c2s.erl b/src/ejabberd_c2s.erl
index 8874c48ad..5fb81d1f5 100644
--- a/src/ejabberd_c2s.erl
+++ b/src/ejabberd_c2s.erl
@@ -2694,8 +2694,8 @@ handle_a(#state{jid = JID, mgmt_stanzas_out = NumStanzasOut} = StateData,
 		 [jlib:jid_to_string(JID), H, NumStanzasOut]),
 	  mgmt_queue_drop(StateData, H);
       _ ->
-	  ?WARNING_MSG("Ignoring invalid ACK element from ~s",
-		       [jlib:jid_to_string(JID)]),
+	  ?DEBUG("Ignoring invalid ACK element from ~s",
+		 [jlib:jid_to_string(JID)]),
 	  StateData
     end.