diff --git a/paddle/fluid/operators/sequence_softmax_op.cc b/paddle/fluid/operators/sequence_softmax_op.cc
index e97404cf505a1487eb12d0b7b826eb0a1d9a632c..47ba9a7445ce6b7039fd8fdcfd383fe370d13f74 100644
--- a/paddle/fluid/operators/sequence_softmax_op.cc
+++ b/paddle/fluid/operators/sequence_softmax_op.cc
@@ -15,8 +15,6 @@ limitations under the License. */
 #include "paddle/fluid/operators/sequence_softmax_op.h"
 #include <string>
 
-#include <string>
-
 namespace paddle {
 namespace operators {