diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c
index 2c0113d..f5a74d1 100644
--- a/bgpd/bgp_packet.c
+++ b/bgpd/bgp_packet.c
@@ -1381,7 +1381,7 @@
 
   /* remote router-id check. */
   if (remote_id.s_addr == 0
-      || ntohl (remote_id.s_addr) >= 0xe0000000
+      || IPV4_CLASS_DE (ntohl (remote_id.s_addr))
       || ntohl (peer->local_id.s_addr) == ntohl (remote_id.s_addr))
     {
       if (BGP_DEBUG (normal, NORMAL))
diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index e325f66..6477a7c 100644
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -1812,9 +1812,9 @@
   /* IPv4 unicast next hop check.  */
   if (afi == AFI_IP && safi == SAFI_UNICAST)
     {
-     /* Next hop must not be 0.0.0.0 nor Class E address. */
+     /* Next hop must not be 0.0.0.0 nor Class D/E address. */
       if (new_attr.nexthop.s_addr == 0
-         || ntohl (new_attr.nexthop.s_addr) >= 0xe0000000)
+         || IPV4_CLASS_DE (ntohl (new_attr.nexthop.s_addr)))
        {
          bgp_attr_unintern (&attr_new);
 
@@ -2068,11 +2068,11 @@
 	  goto filtered;
 	}
 
-      /* Next hop must not be 0.0.0.0 nor Class E address.  Next hop
+      /* Next hop must not be 0.0.0.0 nor Class D/E address. Next hop
 	 must not be my own address.  */
       if (bgp_nexthop_self (afi, &new_attr)
 	  || new_attr.nexthop.s_addr == 0
-	  || ntohl (new_attr.nexthop.s_addr) >= 0xe0000000)
+	  || IPV4_CLASS_DE (ntohl (new_attr.nexthop.s_addr)))
 	{
 	  reason = "martian next-hop;";
 	  goto filtered;
diff --git a/lib/prefix.h b/lib/prefix.h
index 12c0d07..dab4202 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -112,7 +112,7 @@
 #define IPV4_NET0(a)    ((((u_int32_t) (a)) & 0xff000000) == 0x00000000)
 #define IPV4_NET127(a)  ((((u_int32_t) (a)) & 0xff000000) == 0x7f000000)
 #define IPV4_LINKLOCAL(a) ((((u_int32_t) (a)) & 0xffff0000) == 0xa9fe0000)
-#define IPV4_CLASS_DE(a) ((u_int32_t) (a) >= 0xe0000000)
+#define IPV4_CLASS_DE(a)  ((((u_int32_t) (a)) & 0xe0000000) == 0xe0000000)
 
 /* Max bit/byte length of IPv6 address. */
 #define IPV6_MAX_BYTELEN    16