diff --git a/python/paddle/fluid/__init__.py b/python/paddle/fluid/__init__.py
index a6416326ed..ac2a7ea47e 100644
--- a/python/paddle/fluid/__init__.py
+++ b/python/paddle/fluid/__init__.py
@@ -119,7 +119,8 @@ def __bootstrap__():
         'eager_delete_tensor_gb', 'allocator_strategy',
         'reader_queue_speed_test_mode', 'print_sub_graph_dir'
     ]
-    if sysstr != 'Darwin':
+    if 'Darwin' not in sysstr:
+        print("aaaaa")
         read_env_flags.append('use_pinned_memory')
 
     if os.name != 'nt':