diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c
--- a/sys/netinet/tcp_subr.c
+++ b/sys/netinet/tcp_subr.c
@@ -1086,7 +1086,7 @@
 	/* We don't use the pointer */
 	*ptr = NULL;
 
-	KASSERT(tp->t_state >= 0 && tp->t_state < TCPS_TIME_WAIT,
+	KASSERT(tp->t_state < TCPS_TIME_WAIT,
 	    ("%s: connection %p in unexpected state %d", __func__, tp,
 	    tp->t_state));