diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
index 82a60dbb9bbb..7e2eba42e10b 100644
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -1010,10 +1010,8 @@ tcp_input(m, off0)
 	KASSERT(headlocked, ("tcp_input: after_listen: head not locked"));
 	INP_LOCK_ASSERT(inp);
 
-	/* XXX temp debugging */
-	/* should not happen - syncache should pick up these connections */
-	if (tp->t_state == TCPS_LISTEN)
-		panic("tcp_input: TCPS_LISTEN");
+	/* Syncache takes care of sockets in the listen state. */
+	KASSERT(tp->t_state != TCPS_LISTEN, ("tcp_input: TCPS_LISTEN"));
 
 	/*
 	 * This is the second part of the MSS DoS prevention code (after
diff --git a/sys/netinet/tcp_reass.c b/sys/netinet/tcp_reass.c
index 82a60dbb9bbb..7e2eba42e10b 100644
--- a/sys/netinet/tcp_reass.c
+++ b/sys/netinet/tcp_reass.c
@@ -1010,10 +1010,8 @@ tcp_input(m, off0)
 	KASSERT(headlocked, ("tcp_input: after_listen: head not locked"));
 	INP_LOCK_ASSERT(inp);
 
-	/* XXX temp debugging */
-	/* should not happen - syncache should pick up these connections */
-	if (tp->t_state == TCPS_LISTEN)
-		panic("tcp_input: TCPS_LISTEN");
+	/* Syncache takes care of sockets in the listen state. */
+	KASSERT(tp->t_state != TCPS_LISTEN, ("tcp_input: TCPS_LISTEN"));
 
 	/*
 	 * This is the second part of the MSS DoS prevention code (after