diff --git a/python/paddle/fluid/layers/loss.py b/python/paddle/fluid/layers/loss.py
index 9aaa6afd7e4e93d025b699e95b91a46a8003e037..c0d158f7a77b24274e5b4c0a7e63090a14db038c 100644
--- a/python/paddle/fluid/layers/loss.py
+++ b/python/paddle/fluid/layers/loss.py
@@ -23,7 +23,8 @@ from ..framework import Variable, in_dygraph_mode
 from .. import core
 from ..data_feeder import check_type_and_dtype
 from ..param_attr import ParamAttr
-from ..initializer import NumpyArrayInitializer
+from ..initializer import NumpyArrayInitializer, Constant
+from .. import core
 
 __all__ = [
     'center_loss',