diff --git a/vnet/vnet/unix/tapcli.h b/vnet/vnet/unix/tapcli.h
index 00a96c6..76580bf 100644
--- a/vnet/vnet/unix/tapcli.h
+++ b/vnet/vnet/unix/tapcli.h
@@ -38,4 +38,8 @@
 
 int vnet_tap_dump_ifs (tapcli_interface_details_t **out_tapids);
 
+#define TAP_MTU_MIN 68
+#define TAP_MTU_MAX 65535
+#define TAP_MTU_DEFAULT 1500
+
 #endif /* __included_tapcli_h__ */