diff --git a/zebra/rib.h b/zebra/rib.h
index 8d12846..a1a9e1d 100644
--- a/zebra/rib.h
+++ b/zebra/rib.h
@@ -23,6 +23,8 @@
 #ifndef _ZEBRA_RIB_H
 #define _ZEBRA_RIB_H
 
+#include "prefix.h"
+
 #define DISTANCE_INFINITY  255
 
 /* Routing information base. */