diff --git a/ripd/rip_interface.c b/ripd/rip_interface.c
index 00612df..7bdcf46 100644
--- a/ripd/rip_interface.c
+++ b/ripd/rip_interface.c
@@ -74,7 +74,7 @@
 ipv4_multicast_join (int sock, 
 		     struct in_addr group, 
 		     struct in_addr ifa,
-		     unsigned int ifindex)
+		     ifindex_t ifindex)
 {
   int ret;
 
@@ -95,7 +95,7 @@
 ipv4_multicast_leave (int sock, 
 		      struct in_addr group, 
 		      struct in_addr ifa,
-		      unsigned int ifindex)
+		      ifindex_t ifindex)
 {
   int ret;