diff --git a/python/paddle/v2/master/client.py b/python/paddle/v2/master/client.py
index ebc5f217765bc63e61d8659f8bb9fd8fa586f286..3ac62d116bc7d0f68069d41c9f2b3da687c19ca3 100644
--- a/python/paddle/v2/master/client.py
+++ b/python/paddle/v2/master/client.py
@@ -5,8 +5,8 @@ __lib__ = None
 
 
 def get_c_lib():
+    global __lib__
     if __lib__ is None:
-        global __lib__
         path = os.path.join(os.path.dirname(__file__), "libpaddle_master.so")
         __lib__ = ctypes.cdll.LoadLibrary(path)
     return __lib__