diff --git a/libretro-common/include/file/nbio.h b/libretro-common/include/file/nbio.h
index e9dde535a2..522b1e9548 100644
--- a/libretro-common/include/file/nbio.h
+++ b/libretro-common/include/file/nbio.h
@@ -1,7 +1,10 @@
+#ifndef _NBIO_STDIO_H
+#define _NBIO_STDIO_H
+
 #include <stddef.h>
 #include <boolean.h>
 
-enum nbio_mode_t
+enum nbio_mode
 {
    /* The comments tell which mode in fopen() it corresponds to. */
    NBIO_READ = 0,/* rb */
@@ -55,3 +58,5 @@ void nbio_cancel(struct nbio_t* handle);
  * Deletes the nbio structure and its associated pointer.
  */
 void nbio_free(struct nbio_t* handle);
+
+#endif
\ No newline at end of file