diff --git a/bpf-filter.h b/bpf-filter.h
index 9bd15d8d..469db0ec 100644
--- a/bpf-filter.h
+++ b/bpf-filter.h
@@ -47,7 +47,7 @@ static const struct bpf_insn arp_bpf_filter [] = {
 	/* Otherwise, drop it. */
 	BPF_STMT(BPF_RET + BPF_K, 0),
 };
-static const size_t arp_bpf_filter_len =
+static const unsigned int arp_bpf_filter_len =
     sizeof(arp_bpf_filter) / sizeof(arp_bpf_filter[0]);
 
 
@@ -97,5 +97,5 @@ static const struct bpf_insn dhcp_bpf_filter [] = {
 	/* Otherwise, drop it. */
 	BPF_STMT(BPF_RET + BPF_K, 0),
 };
-static const size_t dhcp_bpf_filter_len =
+static const unsigned int dhcp_bpf_filter_len =
     sizeof(dhcp_bpf_filter) / sizeof(dhcp_bpf_filter[0]);
diff --git a/lpf.c b/lpf.c
index 2501ed0b..a3b1b62b 100644
--- a/lpf.c
+++ b/lpf.c
@@ -92,10 +92,10 @@ ipv4_opensocket(struct interface *ifp, int protocol)
 	memset(&pf, 0, sizeof(pf));
 	if (protocol == ETHERTYPE_ARP) {
 		pf.filter = UNCONST(arp_bpf_filter);
-		pf.len = (unsigned int)arp_bpf_filter_len;
+		pf.len = arp_bpf_filter_len;
 	} else {
 		pf.filter = UNCONST(dhcp_bpf_filter);
-		pf.len = (unsigned int)dhcp_bpf_filter_len;
+		pf.len = dhcp_bpf_filter_len;
 	}
 	if (setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &pf, sizeof(pf)) != 0)
 		goto eexit;