diff --git a/test/operators/test_sequence_softmax_op.cpp b/test/operators/test_sequence_softmax_op.cpp
index 9e698d933a97525dac32948466e2600a9b217033..17ab5d7a653a0bb57892ced969ef199a9bde16c3 100644
--- a/test/operators/test_sequence_softmax_op.cpp
+++ b/test/operators/test_sequence_softmax_op.cpp
@@ -34,7 +34,7 @@ void SequenceSoftmax(const framework::LoDTensor *X, framework::LoDTensor *Y) {
     }
     float sum = 0.f;
     for (int j = 0; j < num_classes; ++j) {
-      float tmp = std::expf(input[j] - max);
+      float tmp = expf(input[j] - max);
       sum += tmp;
       output[j] = tmp;
     }
diff --git a/test/operators/test_softmax_op.cpp b/test/operators/test_softmax_op.cpp
index e94933eaa90f96982f90f713e04f05a999424697..1cf39e3effeb8761fb105858ed302cac1cf95872 100644
--- a/test/operators/test_softmax_op.cpp
+++ b/test/operators/test_softmax_op.cpp
@@ -38,7 +38,7 @@ void Softmax(const framework::Tensor *X, framework::Tensor *Y) {
       }
       float sum = 0.f;
       for (int j = 0; j < num_classes; ++j) {
-        float tmp = std::expf(input[j] - max);
+        float tmp = expf(input[j] - max);
         sum += tmp;
         output[j] = tmp;
       }