diff --git a/pimd/pim_iface.h b/pimd/pim_iface.h
index 8806fdd..8cad3d1 100644
--- a/pimd/pim_iface.h
+++ b/pimd/pim_iface.h
@@ -122,8 +122,8 @@
 void pim_if_add_vif_all(void);
 void pim_if_del_vif_all(void);
 
-struct interface *pim_if_find_by_vif_index(int vif_index);
-int pim_if_find_vifindex_by_ifindex(int ifindex);
+struct interface *pim_if_find_by_vif_index(ifindex_t vif_index);
+int pim_if_find_vifindex_by_ifindex(ifindex_t ifindex);
 
 int pim_if_lan_delay_enabled(struct interface *ifp);
 uint16_t pim_if_effective_propagation_delay_msec(struct interface *ifp);