diff --git a/zebra/router-id.c b/zebra/router-id.c
index 3d6b511..b738027 100644
--- a/zebra/router-id.c
+++ b/zebra/router-id.c
@@ -230,10 +230,8 @@
 {
   const struct connected *ifa = (const struct connected *)a;
   const struct connected *ifb = (const struct connected *)b;
-  unsigned int A = ntohl(ifa->address->u.prefix4.s_addr);
-  unsigned int B = ntohl(ifb->address->u.prefix4.s_addr);
 
-  return (int) (A - B);
+  return IPV4_ADDR_CMP(&ifa->address->u.prefix4.s_addr,&ifb->address->u.prefix4.s_addr);
 }
 
 void