diff --git a/paddle/gserver/tests/test_PyDataProvider2.cpp b/paddle/gserver/tests/test_PyDataProvider2.cpp
index c5fe31b29187f4a5b429a928d1870a06848691fa..e75e53ab7f431a34798e8a79985f30441005098c 100644
--- a/paddle/gserver/tests/test_PyDataProvider2.cpp
+++ b/paddle/gserver/tests/test_PyDataProvider2.cpp
@@ -321,7 +321,7 @@ TEST(PyDataProvider2, input_order) {
     if (!realBatchSize) {
       break;
     }
-    ASSERT_EQ(batch.getStreams().size(), 2);
+    ASSERT_EQ(batch.getStreams().size(), (size_t)2);
     for (size_t i = 0; i < realBatchSize; ++i) {
       ASSERT_EQ(batch.getStream(0).ids->getData()[i], 0);
       ASSERT_EQ(batch.getStream(1).ids->getData()[i], 1);
diff --git a/paddle/utils/tests/test_ThreadBarrier.cpp b/paddle/utils/tests/test_ThreadBarrier.cpp
index 241cdda7bd1c90335e85c7a559afd0c84c255009..90bd6c21bc8e5ac05b248a0517f9e4fb43d04054 100644
--- a/paddle/utils/tests/test_ThreadBarrier.cpp
+++ b/paddle/utils/tests/test_ThreadBarrier.cpp
@@ -32,7 +32,7 @@ void testNormalImpl(size_t thread_num,
 
  std::vector<std::thread> threads;
  threads.reserve(thread_num);
- for (int32_t i = 0; i < thread_num; ++i) {
+ for (size_t i = 0; i < thread_num; ++i) {
     threads.emplace_back([&thread_num, &mutex,
                          &tids, &barrier, &callback]{
         callback(thread_num, mutex, tids, barrier);