diff --git a/lib/if.h b/lib/if.h
index e3ec278f9f..d2f0f87b71 100644
--- a/lib/if.h
+++ b/lib/if.h
@@ -299,7 +299,7 @@ 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)                                             \