diff --git a/sys/netinet/tcp_fastopen.c b/sys/netinet/tcp_fastopen.c
index 98df703a1cce..9176c0d640bd 100644
--- a/sys/netinet/tcp_fastopen.c
+++ b/sys/netinet/tcp_fastopen.c
@@ -1101,7 +1101,7 @@ tcp_fastopen_ccache_bucket_trim(struct tcp_fastopen_ccache_bucket *ccb,
 		if (entries > limit)
 			tcp_fastopen_ccache_entry_drop(cce, ccb);
 	}
-	KASSERT(ccb->ccb_num_entries <= limit,
+	KASSERT(ccb->ccb_num_entries <= (int)limit,
 	    ("%s: ccb->ccb_num_entries %d exceeds limit %d", __func__,
 		ccb->ccb_num_entries, limit));
 	if (limit == 0) {