diff --git a/bsp/xplorer4330/m4/SConscript b/bsp/xplorer4330/m4/SConscript
index 2adbbaa3dc2d427a5e22a0568de2954514114a9c..e8d5aac16d7ddf218442b64b819dc170af458cfa 100644
--- a/bsp/xplorer4330/m4/SConscript
+++ b/bsp/xplorer4330/m4/SConscript
@@ -2,11 +2,11 @@ from building import *
 
 cwd  = GetCurrentDir()
 objs = []
-list = os.listdir(cwd+'\\..')
+list = os.listdir(os.path.join(cwd, '..'))
 
 for d in list:
     if d!='m4':
-        path = os.path.join(cwd+'\\..', d)
+        path = os.path.join(cwd, '..', d)
         if os.path.isfile(os.path.join(path, 'SConscript')):
             objs = objs + SConscript(os.path.join(path, 'SConscript'))