diff --git a/bsp/simulator/applications/dfs_win32.c b/bsp/simulator/applications/dfs_win32.c
index 121ed39b81bc5c531f77ef1375621785d430546c..acc8a3cb0ab95b80ba360a075fe24f09bdd25f7a 100644
--- a/bsp/simulator/applications/dfs_win32.c
+++ b/bsp/simulator/applications/dfs_win32.c
@@ -27,6 +27,22 @@
 #include <WinError.h>
 #include  <windows.h>
 
+#if defined(__MINGW32__) && defined(_NO_OLDNAMES)
+#define O_RDONLY    _O_RDONLY
+#define O_WRONLY    _O_WRONLY
+#define O_RDWR      _O_RDWR
+#define O_ACCMODE   _O_ACCMODE
+#define O_APPEND    _O_APPEND
+#define O_CREAT     _O_CREAT
+#define O_TRUNC     _O_TRUNC
+#define O_EXCL      _O_EXCL
+#define O_TEXT      _O_TEXT
+#define O_BINARY    _O_BINARY
+#define O_TEMPORARY _O_TEMPORARY
+#define O_NOINHERIT _O_NOINHERIT
+#define O_SEQUENTIAL   _O_SEQUENTIAL
+#define O_RANDOM    _O_RANDOM
+#endif
 /*
  * RT-Thread DFS Interface for win-directory as an disk device
  */
diff --git a/bsp/simulator/rtconfig.h b/bsp/simulator/rtconfig.h
index 81e8c0d9d7399b2b87ea9007dc950be2356cf645..79c90eb1e99817ea84e7f29d373bb8b423485da5 100755
--- a/bsp/simulator/rtconfig.h
+++ b/bsp/simulator/rtconfig.h
@@ -143,7 +143,7 @@
 /* DFS: windows share directory mounted to rt-thread/dfs  */
 /* only used in bsp/simulator */
 #ifdef _WIN32
-//#define RT_USING_DFS_WINSHAREDIR
+#define RT_USING_DFS_WINSHAREDIR
 #endif
 
 /* the max number of mounted file system */