diff --git a/tap.c b/tap.c
index d6bad5a..a3fc249 100644
--- a/tap.c
+++ b/tap.c
@@ -340,7 +340,7 @@ resume:
 		iph = (struct iphdr *)(eh + 1);
 		if ((iph->ihl * 4) + sizeof(*eh) > len)
 			continue;
-		if (iph->ihl * 4 < sizeof(*iph))
+		if (iph->ihl * 4 < (int)sizeof(*iph))
 			continue;
 
 		if (iph->saddr && c->addr4_seen != iph->saddr) {
diff --git a/tcp.c b/tcp.c
index b0d5f40..2a842bd 100644
--- a/tcp.c
+++ b/tcp.c
@@ -1034,7 +1034,7 @@ static int tcp_opt_get(struct tcphdr *th, size_t len, uint8_t type_search,
 	uint8_t type, optlen;
 	char *p;
 
-	if (len > th->doff * 4)
+	if (len > (unsigned)th->doff * 4)
 		len = th->doff * 4;
 
 	len -= sizeof(*th);