diff --git a/python/paddle/fluid/layers/control_flow.py b/python/paddle/fluid/layers/control_flow.py
index 21454370dd28f02a767ad3935021c13f4205eabc..9d98e8333ba07ac3eed3a3b63adcba1919cb4694 100644
--- a/python/paddle/fluid/layers/control_flow.py
+++ b/python/paddle/fluid/layers/control_flow.py
@@ -235,8 +235,7 @@ class BlockGuardWithCompletion(BlockGuard):
 
     def __init__(self, rnn):
         if not isinstance(rnn, StaticRNN):
-            raise TypeError(
-                "BlockGuardWithCompletion takes a StaticRNN or ParallelDo")
+            raise TypeError("BlockGuardWithCompletion takes a StaticRNN")
         super(BlockGuardWithCompletion, self).__init__(rnn.helper.main_program)
         self.rnn = rnn