diff --git a/pimd/pim_sock.h b/pimd/pim_sock.h
index cfe39ad..622fb47 100644
--- a/pimd/pim_sock.h
+++ b/pimd/pim_sock.h
@@ -40,15 +40,15 @@
 int pim_socket_raw(int protocol);
 int pim_socket_mcast(int protocol, struct in_addr ifaddr, int loop);
 int pim_socket_join(int fd, struct in_addr group,
-		    struct in_addr ifaddr, int ifindex);
-int pim_socket_join_source(int fd, int ifindex,
+		    struct in_addr ifaddr, ifindex_t ifindex);
+int pim_socket_join_source(int fd, ifindex_t ifindex,
 			   struct in_addr group_addr,
 			   struct in_addr source_addr,
 			   const char *ifname);
 int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len,
 			  struct sockaddr_in *from, socklen_t *fromlen,
 			  struct sockaddr_in *to, socklen_t *tolen,
-			  int *ifindex);
+			  ifindex_t *ifindex);
 
 int pim_socket_mcastloop_get(int fd);