diff --git a/python/paddle/fluid/layers/rnn.py b/python/paddle/fluid/layers/rnn.py
index cb12464349606abe35dd6cad8a0667107dc2fd03..e4596b1ac2f840e7f3a60154c5d97912a9247271 100644
--- a/python/paddle/fluid/layers/rnn.py
+++ b/python/paddle/fluid/layers/rnn.py
@@ -23,6 +23,7 @@ from . import control_flow
 from . import utils
 from . import sequence_lod
 from .utils import *
+from .. import core
 from ..framework import default_main_program
 from ..data_feeder import convert_dtype
 from ..layer_helper import LayerHelper