diff --git a/python/paddle/fluid/__init__.py b/python/paddle/fluid/__init__.py
index 2a28f7b2d1cadd9e4376f9ddf5ab4d6179a50fe9..6a4a5e098fc27e02104baa837d939a62cc2a22a8 100644
--- a/python/paddle/fluid/__init__.py
+++ b/python/paddle/fluid/__init__.py
@@ -116,9 +116,8 @@ def __bootstrap__():
         'use_pinned_memory', 'check_nan_inf', 'benchmark', 'eager_delete_scope',
         'use_mkldnn', 'use_ngraph', 'initial_cpu_memory_in_mb',
         'init_allocated_mem', 'free_idle_memory', 'paddle_num_threads',
-        "dist_threadpool_size", 'eager_delete_tensor_gb',
-        'allocator_strategy', 'reader_queue_speed_test_mode',
-        'print_sub_graph_dir'
+        "dist_threadpool_size", 'eager_delete_tensor_gb', 'allocator_strategy',
+        'reader_queue_speed_test_mode', 'print_sub_graph_dir'
     ]
     if os.name != 'nt':
         read_env_flags.append('warpctc_dir')