diff --git a/src/l2cap.c b/src/l2cap.c
index 465315316..3d677c119 100644
--- a/src/l2cap.c
+++ b/src/l2cap.c
@@ -304,7 +304,7 @@ static l2cap_channel_t * l2cap_channel_for_rtx_timer(btstack_timer_source_t * ts
 
 static void l2cap_rtx_timeout(btstack_timer_source_t * ts){
     l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts);
-    if (!ts) return;
+    if (!channel) return;
 
     log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid);