diff --git a/lib/if.h b/lib/if.h
index a3c6e9ff5b..51db7bb8ed 100644
--- a/lib/if.h
+++ b/lib/if.h
@@ -305,7 +305,7 @@ struct interface {
 RB_HEAD(if_name_head, interface);
 RB_PROTOTYPE(if_name_head, interface, name_entry, if_cmp_func)
 RB_HEAD(if_index_head, interface);
-RB_PROTOTYPE(if_index_head, interface, index_entry, if_cmp_func)
+RB_PROTOTYPE(if_index_head, interface, index_entry, if_cmp_index_func)
 DECLARE_QOBJ_TYPE(interface)
 
 #define IFNAME_RB_INSERT(vrf, ifp)                                             \