diff --git a/etc/iproute2/rt_dsfield b/etc/iproute2/rt_dsfield
index c0f3679b..1426d601 100644
--- a/etc/iproute2/rt_dsfield
+++ b/etc/iproute2/rt_dsfield
@@ -22,4 +22,5 @@
 0xA0	CS5
 0xC0	CS6
 0xE0	CS7
-0x5C	EF
+# RFC 2598
+0xB8	EF