diff --git a/net/tap-bsd.c b/net/tap-bsd.c
index efccfe08a7..2f3efdee03 100644
--- a/net/tap-bsd.c
+++ b/net/tap-bsd.c
@@ -43,8 +43,8 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required
     char *dev;
     struct stat s;
 
-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
-    /* if no ifname is given, always start the search from tap0. */
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
+    /* if no ifname is given, always start the search from tap0/tun0. */
     int i;
     char dname[100];
 
@@ -52,7 +52,11 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required
         if (*ifname) {
             snprintf(dname, sizeof dname, "/dev/%s", ifname);
         } else {
+#if defined(__OpenBSD__)
+            snprintf(dname, sizeof dname, "/dev/tun%d", i);
+#else
             snprintf(dname, sizeof dname, "/dev/tap%d", i);
+#endif
         }
         TFR(fd = open(dname, O_RDWR));
         if (fd >= 0) {