diff --git a/lib/libalias/alias_pptp.c b/lib/libalias/alias_pptp.c
index 174780fc29fe..05722b10813d 100644
--- a/lib/libalias/alias_pptp.c
+++ b/lib/libalias/alias_pptp.c
@@ -300,7 +300,7 @@ AliasVerifyPptp(struct ip *pip, u_int16_t * ptype)
 		return (NULL);
 
 	/* Move up to PPTP message header */
-	hptr = (PptpMsgHead) ip_next(pip);
+	hptr = (PptpMsgHead) tcp_next(tc);
 
 	/* Return the control message type */
 	*ptype = ntohs(hptr->type);
diff --git a/lib/libalias/alias_skinny.c b/lib/libalias/alias_skinny.c
index fccecc6764bb..74c283c73cf1 100644
--- a/lib/libalias/alias_skinny.c
+++ b/lib/libalias/alias_skinny.c
@@ -228,7 +228,7 @@ AliasHandleSkinny(struct libalias *la, struct ip *pip, struct alias_link *lnk)
 	tlen = ntohs(pip->ip_len);
 	dlen = tlen - hlen;
 
-	sd = (struct skinny_header *)ip_next(pip);
+	sd = (struct skinny_header *)tcp_next(tc);
 
 	/*
 	 * XXX This direction is reserved for future use.  I still need to
diff --git a/sys/netinet/libalias/alias_pptp.c b/sys/netinet/libalias/alias_pptp.c
index 174780fc29fe..05722b10813d 100644
--- a/sys/netinet/libalias/alias_pptp.c
+++ b/sys/netinet/libalias/alias_pptp.c
@@ -300,7 +300,7 @@ AliasVerifyPptp(struct ip *pip, u_int16_t * ptype)
 		return (NULL);
 
 	/* Move up to PPTP message header */
-	hptr = (PptpMsgHead) ip_next(pip);
+	hptr = (PptpMsgHead) tcp_next(tc);
 
 	/* Return the control message type */
 	*ptype = ntohs(hptr->type);
diff --git a/sys/netinet/libalias/alias_skinny.c b/sys/netinet/libalias/alias_skinny.c
index fccecc6764bb..74c283c73cf1 100644
--- a/sys/netinet/libalias/alias_skinny.c
+++ b/sys/netinet/libalias/alias_skinny.c
@@ -228,7 +228,7 @@ AliasHandleSkinny(struct libalias *la, struct ip *pip, struct alias_link *lnk)
 	tlen = ntohs(pip->ip_len);
 	dlen = tlen - hlen;
 
-	sd = (struct skinny_header *)ip_next(pip);
+	sd = (struct skinny_header *)tcp_next(tc);
 
 	/*
 	 * XXX This direction is reserved for future use.  I still need to