diff --git a/SMP/unistd.h b/SMP/unistd.h
index b54d4be15..273204e00 100644
--- a/SMP/unistd.h
+++ b/SMP/unistd.h
@@ -32,6 +32,8 @@
 #include <direct.h>
 #include <fcntl.h>
 
+#define mkdir(path, mode) _mkdir(path)
+
 #define R_OK    4       /* Test for read permission.  */
 #define W_OK    2       /* Test for write permission.  */
 //#define   X_OK    1       /* execute permission - unsupported in windows*/