diff --git a/curvefs/test/metaserver/storage/dumpfile_test.cpp b/curvefs/test/metaserver/storage/dumpfile_test.cpp
index ee618e955c..cfa9c8ee11 100644
--- a/curvefs/test/metaserver/storage/dumpfile_test.cpp
+++ b/curvefs/test/metaserver/storage/dumpfile_test.cpp
@@ -39,6 +39,7 @@ namespace storage {
 
 using Hash = std::unordered_map<std::string, std::string>;
 
+namespace {
 class HashIterator : public Iterator {
  public:
     explicit HashIterator(Hash* hash)
@@ -56,6 +57,7 @@ class HashIterator : public Iterator {
     Hash::iterator iter_;
     Hash* hash_;
 };
+}  // namespace
 
 class DumpFileTest : public ::testing::Test {
  protected:
diff --git a/curvefs/test/metaserver/storage/iterator_test.cpp b/curvefs/test/metaserver/storage/iterator_test.cpp
index ca76d40c30..f28a4ffcaa 100644
--- a/curvefs/test/metaserver/storage/iterator_test.cpp
+++ b/curvefs/test/metaserver/storage/iterator_test.cpp
@@ -38,8 +38,8 @@ namespace storage {
 
 using Hash = std::unordered_map<std::string, std::string>;
 using ContainerType = std::map<std::string, std::string>;
-using google::protobuf::util::MessageDifferencer;
 
+namespace {
 class HashIterator : public Iterator {
  public:
     explicit HashIterator(Hash* hash)
@@ -58,6 +58,7 @@ class HashIterator : public Iterator {
     Hash* hash_;
     Hash::iterator iter_;
 };
+}  // namespace
 
 class IteratorTest : public ::testing::Test {
  protected: