diff --git a/sys/netinet/libalias/alias.c b/sys/netinet/libalias/alias.c
--- a/sys/netinet/libalias/alias.c
+++ b/sys/netinet/libalias/alias.c
@@ -435,7 +435,8 @@
 IcmpAliasIn(struct libalias *la, struct ip *pip)
 {
 	struct icmp *ic;
-	int dlen, iresult;
+	int iresult;
+	size_t dlen;
 
 	LIBALIAS_LOCK_ASSERT(la);
 
@@ -462,7 +463,7 @@
 	case ICMP_TIMXCEED:
 	case ICMP_PARAMPROB:
 		if (dlen < ICMP_ADVLENMIN ||
-		    dlen < ICMP_ADVLEN(ic))
+		    dlen < (size_t)ICMP_ADVLEN(ic))
 			return (PKT_ALIAS_IGNORED);
 		iresult = IcmpAliasIn2(la, pip);
 		break;
@@ -728,7 +729,7 @@
 {
 	struct udphdr *ud;
 	struct alias_link *lnk;
-	int dlen;
+	size_t dlen;
 
 	LIBALIAS_LOCK_ASSERT(la);
 
@@ -827,7 +828,8 @@
 	u_short dest_port;
 	u_short proxy_server_port;
 	int proxy_type;
-	int dlen, error;
+	int error;
+	size_t dlen;
 
 	LIBALIAS_LOCK_ASSERT(la);
 
@@ -930,7 +932,7 @@
 {
 	struct tcphdr *tc;
 	struct alias_link *lnk;
-	int dlen;
+	size_t dlen;
 
 	LIBALIAS_LOCK_ASSERT(la);
 
@@ -1055,9 +1057,10 @@
 static int
 TcpAliasOut(struct libalias *la, struct ip *pip, int maxpacketsize, int create)
 {
-	int dlen, proxy_type, error;
+	int proxy_type, error;
 	u_short dest_port;
 	u_short proxy_server_port;
+	size_t dlen;
 	struct in_addr dest_address;
 	struct in_addr proxy_server_address;
 	struct tcphdr *tc;
diff --git a/sys/netinet/libalias/alias_mod.c b/sys/netinet/libalias/alias_mod.c
--- a/sys/netinet/libalias/alias_mod.c
+++ b/sys/netinet/libalias/alias_mod.c
@@ -129,7 +129,7 @@
 
 #ifndef _KERNEL
 /* Dll manipulation code - this code is not thread safe... */
-SLIST_HEAD(dll_chain, dll) dll_chain = SLIST_HEAD_INITIALIZER(dll_chain);
+static SLIST_HEAD(dll_chain, dll) dll_chain = SLIST_HEAD_INITIALIZER(dll_chain);
 int
 attach_dll(struct dll *p)
 {