diff --git a/zebra/if_proc.c b/zebra/if_proc.c
index 6002595..367b0d6 100644
--- a/zebra/if_proc.c
+++ b/zebra/if_proc.c
@@ -123,8 +123,8 @@
 }
 
 /* Update interface's statistics. */
-int
-ifstat_update_proc ()
+void
+ifstat_update_proc (void)
 {
   FILE *fp;
   char buf[PROCBUFSIZ];
@@ -139,7 +139,7 @@
     {
       zlog_warn ("Can't open proc file %s: %s",
 		 _PATH_PROC_NET_DEV, safe_strerror (errno));
-      return -1;
+      return;
     }
 
   /* Drop header lines. */
@@ -162,7 +162,7 @@
       ifstat_dev_fields (version, stat, ifp);
     }
   fclose(fp);
-  return 0;
+  return;
 }
 
 /* Interface structure allocation by proc filesystem. */