diff --git a/uisimulator/win32/dir-win32.h b/uisimulator/win32/dir-win32.h
index e51dfba747..6a19b5c535 100644
--- a/uisimulator/win32/dir-win32.h
+++ b/uisimulator/win32/dir-win32.h
@@ -20,8 +20,10 @@
 #ifndef __FILE_WIN32_H__
 #define __FILE_WIN32_H__
 
+#define mkdir(x) dos_mkdir(x)
+
 #include <io.h>
 #include "dir.h"
 
 
-#endif // #ifndef __FILE_WIN32_H__
\ No newline at end of file
+#endif // #ifndef __FILE_WIN32_H__