diff --git a/src/braft/util.cpp b/src/braft/util.cpp
index 053d7384..9770b753 100644
--- a/src/braft/util.cpp
+++ b/src/braft/util.cpp
@@ -35,11 +35,11 @@ static bool valid_percentile(const char*, int32_t v) {
     return v > 0 && v < 100;
 }
 
-const bool ALLOW_UNUSED dummy_bvar_counter_p1 = ::google::RegisterFlagValidator(
+const bool ALLOW_UNUSED dummy_bvar_counter_p1 = GFLAGS_NS::RegisterFlagValidator(
     &FLAGS_bvar_counter_p1, valid_percentile);
-const bool ALLOW_UNUSED dummy_bvar_counter_p2 = ::google::RegisterFlagValidator(
+const bool ALLOW_UNUSED dummy_bvar_counter_p2 = GFLAGS_NS::RegisterFlagValidator(
     &FLAGS_bvar_counter_p2, valid_percentile);
-const bool ALLOW_UNUSED dummy_bvar_counter_p3 = ::google::RegisterFlagValidator(
+const bool ALLOW_UNUSED dummy_bvar_counter_p3 = GFLAGS_NS::RegisterFlagValidator(
     &FLAGS_bvar_counter_p3, valid_percentile);
 
 namespace detail {
diff --git a/test/test_node.cpp b/test/test_node.cpp
index a1744ec6..83567445 100644
--- a/test/test_node.cpp
+++ b/test/test_node.cpp
@@ -505,7 +505,7 @@ class NodeTest : public testing::TestWithParam<const char*> {
     void SetUp() {
         g_dont_print_apply_log = false;
         //logging::FLAGS_v = 90;
-        google::SetCommandLineOption("crash_on_fatal_log", "true");
+        GFLAGS_NS::SetCommandLineOption("crash_on_fatal_log", "true");
         if (GetParam() == std::string("NoReplication")) {
             braft::FLAGS_raft_max_parallel_append_entries_rpc_num = 1;
             braft::FLAGS_raft_enable_append_entries_cache = false;
@@ -1477,7 +1477,7 @@ TEST_P(NodeTest, PreVote) {
 }
 
 TEST_P(NodeTest, Vote_timedout) {
-    google::SetCommandLineOption("raft_step_down_when_vote_timedout", "true");
+    GFLAGS_NS::SetCommandLineOption("raft_step_down_when_vote_timedout", "true");
     std::vector<braft::PeerId> peers;
     for (int i = 0; i < 2; i++) {
         braft::PeerId peer;
@@ -1525,7 +1525,7 @@ TEST_P(NodeTest, Vote_timedout) {
     LOG(WARNING) << "cluster stop";
     cluster.stop_all();
 
-    google::SetCommandLineOption("raft_step_down_when_vote_timedout", "false");
+    GFLAGS_NS::SetCommandLineOption("raft_step_down_when_vote_timedout", "false");
 }
 
 TEST_P(NodeTest, SetPeer1) {
@@ -1840,7 +1840,7 @@ TEST_P(NodeTest, InstallSnapshot) {
 }
 
 TEST_P(NodeTest, install_snapshot_exceed_max_task_num) {
-    google::SetCommandLineOption("raft_max_install_snapshot_tasks_num", "1");
+    GFLAGS_NS::SetCommandLineOption("raft_max_install_snapshot_tasks_num", "1");
     std::vector<braft::PeerId> peers;
     for (int i = 0; i < 5; i++) {
         braft::PeerId peer;
@@ -1943,7 +1943,7 @@ TEST_P(NodeTest, install_snapshot_exceed_max_task_num) {
 
     LOG(WARNING) << "cluster stop";
     cluster.stop_all();
-    google::SetCommandLineOption("raft_max_install_snapshot_tasks_num", "1000");
+    GFLAGS_NS::SetCommandLineOption("raft_max_install_snapshot_tasks_num", "1000");
 }
 
 TEST_P(NodeTest, NoSnapshot) {
@@ -3762,6 +3762,6 @@ INSTANTIATE_TEST_CASE_P(NodeTestWithPipelineReplication,
 int main(int argc, char* argv[]) {
     ::testing::AddGlobalTestEnvironment(new TestEnvironment());
     ::testing::InitGoogleTest(&argc, argv);
-    google::ParseCommandLineFlags(&argc, &argv, true);
+    GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);
     return RUN_ALL_TESTS();
 }
diff --git a/test/test_snapshot.cpp b/test/test_snapshot.cpp
index 5224640e..3e9bce44 100644
--- a/test/test_snapshot.cpp
+++ b/test/test_snapshot.cpp
@@ -759,7 +759,7 @@ TEST_F(SnapshotTest, snapshot_throttle_for_writing) {
 }
 
 TEST_F(SnapshotTest, snapshot_throttle_for_reading_without_enable_throttle) {
-    google::SetCommandLineOption("raft_enable_throttle_when_install_snapshot", "false");
+    GFLAGS_NS::SetCommandLineOption("raft_enable_throttle_when_install_snapshot", "false");
     braft::FileSystemAdaptor* fs;
     FOR_EACH_FILE_SYSTEM_ADAPTOR_BEGIN(fs);
 
@@ -839,11 +839,11 @@ TEST_F(SnapshotTest, snapshot_throttle_for_reading_without_enable_throttle) {
     delete storage1;
 
     FOR_EACH_FILE_SYSTEM_ADAPTOR_END;
-    google::SetCommandLineOption("raft_enable_throttle_when_install_snapshot", "true");
+    GFLAGS_NS::SetCommandLineOption("raft_enable_throttle_when_install_snapshot", "true");
 }
 
 TEST_F(SnapshotTest, snapshot_throttle_for_writing_without_enable_throttle) {
-    google::SetCommandLineOption("raft_enable_throttle_when_install_snapshot", "false");
+    GFLAGS_NS::SetCommandLineOption("raft_enable_throttle_when_install_snapshot", "false");
     braft::FileSystemAdaptor* fs;
     FOR_EACH_FILE_SYSTEM_ADAPTOR_BEGIN(fs);
 
@@ -922,11 +922,11 @@ TEST_F(SnapshotTest, snapshot_throttle_for_writing_without_enable_throttle) {
     delete storage1;
 
     FOR_EACH_FILE_SYSTEM_ADAPTOR_END;
-    google::SetCommandLineOption("raft_enable_throttle_when_install_snapshot", "true");
+    GFLAGS_NS::SetCommandLineOption("raft_enable_throttle_when_install_snapshot", "true");
 }
 
 TEST_F(SnapshotTest, dynamically_change_throttle_threshold) {
-    google::SetCommandLineOption("raft_minimal_throttle_threshold_mb", "1");
+    GFLAGS_NS::SetCommandLineOption("raft_minimal_throttle_threshold_mb", "1");
     braft::FileSystemAdaptor* fs;
     FOR_EACH_FILE_SYSTEM_ADAPTOR_BEGIN(fs);
 
@@ -1005,5 +1005,5 @@ TEST_F(SnapshotTest, dynamically_change_throttle_threshold) {
     delete storage1;
 
     FOR_EACH_FILE_SYSTEM_ADAPTOR_END;
-    google::SetCommandLineOption("raft_minimal_throttle_threshold_mb", "0");
+    GFLAGS_NS::SetCommandLineOption("raft_minimal_throttle_threshold_mb", "0");
 }