diff --git a/include/nuttx/net/tun.h b/include/nuttx/net/tun.h
index d7e29e056d..c67ea6e65b 100644
--- a/include/nuttx/net/tun.h
+++ b/include/nuttx/net/tun.h
@@ -46,8 +46,6 @@
 #include <nuttx/config.h>
 #include <nuttx/net/ioctl.h>
 
-#ifdef CONFIG_NET_TUN
-
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
@@ -59,6 +57,8 @@
 #define IFF_MASK         0x7f
 #define IFF_NO_PI        0x80
 
+#ifdef CONFIG_NET_TUN
+
 /****************************************************************************
  * Public Type Definitions
  ****************************************************************************/