diff --git a/lib/zebra.h b/lib/zebra.h
index a75eb6d..a405d46 100644
--- a/lib/zebra.h
+++ b/lib/zebra.h
@@ -535,4 +535,7 @@
 /* VRF ID type. */
 typedef u_int16_t vrf_id_t;
 
+typedef uint32_t route_tag_t;
+#define ROUTE_TAG_MAX UINT32_MAX
+
 #endif /* _ZEBRA_H */