diff --git a/pimd/pim_pim.c b/pimd/pim_pim.c
index a04a0af..c522475 100644
--- a/pimd/pim_pim.c
+++ b/pimd/pim_pim.c
@@ -269,7 +269,7 @@
   socklen_t tolen = sizeof(to);
   uint8_t buf[PIM_PIM_BUFSIZE_READ];
   int len;
-  int ifindex = -1;
+  ifindex_t ifindex = -1;
   int result = -1; /* defaults to bad */
 
   zassert(t);
@@ -376,7 +376,7 @@
 		 pim_ifp->pim_sock_fd);
 }
 
-static int pim_sock_open(struct in_addr ifaddr, int ifindex)
+static int pim_sock_open(struct in_addr ifaddr, ifindex_t ifindex)
 {
   int fd;