diff --git a/python/paddle/fluid/framework.py b/python/paddle/fluid/framework.py
index 3d88a1377a056d933b2152d569008c6af2f45809..df4691d49e8916e6ff27e08168f9c6579cd06732 100644
--- a/python/paddle/fluid/framework.py
+++ b/python/paddle/fluid/framework.py
@@ -75,7 +75,7 @@ ZERO_VAR_SUFFIX = core.kZeroVarSuffix()
 CONTROL_DEP_VAR_PREFIX = core.kControlDepVarName()
 
 _dygraph_tracer_ = None
-_in_eager_mode_ = (os.environ.get('FLAGS_enable_eager_mode') == '1')
+_in_eager_mode_ = (os.environ.get('FLAGS_enable_eager_mode', '1') == '1')
 _global_expected_place_ = None
 _current_device = None
 global_prog_seed = 0