diff --git a/curvefs/src/mds/fs_manager.cpp b/curvefs/src/mds/fs_manager.cpp
index 3af5b118d3..1d5a3852d1 100644
--- a/curvefs/src/mds/fs_manager.cpp
+++ b/curvefs/src/mds/fs_manager.cpp
@@ -808,15 +808,29 @@ int FsManager::IsExactlySameOrCreateUnComplete(const std::string& fsName,
         return google::protobuf::util::MessageDifferencer::Equals(lhs, rhs);
     };
 
-    auto checkFsInfo = [fsType, volumeInfoComparator](const FsDetail& lhs,
-                                                      const FsDetail& rhs) {
+    auto s3InfoComparator = [](common::S3Info lhs, common::S3Info rhs) {
+        // for compatible with old clients
+        if (lhs.has_objectprefix() && !rhs.has_objectprefix() &&
+            lhs.objectprefix() != 0) {
+            return false;
+        }
+        if (rhs.has_objectprefix() && !lhs.has_objectprefix() &&
+            rhs.objectprefix() != 0) {
+            return false;
+        }
+
+        return google::protobuf::util::MessageDifferencer::Equals(lhs, rhs);
+    };
+
+    auto checkFsInfo = [fsType, volumeInfoComparator, s3InfoComparator](
+                           const FsDetail& lhs, const FsDetail& rhs) {
         switch (fsType) {
             case curvefs::common::FSType::TYPE_S3:
-                return MessageDifferencer::Equals(lhs.s3info(), rhs.s3info());
+                return s3InfoComparator(lhs.s3info(), rhs.s3info());
             case curvefs::common::FSType::TYPE_VOLUME:
                 return volumeInfoComparator(lhs.volume(), rhs.volume());
             case curvefs::common::FSType::TYPE_HYBRID:
-                return MessageDifferencer::Equals(lhs.s3info(), rhs.s3info()) &&
+                return s3InfoComparator(lhs.s3info(), rhs.s3info()) &&
                        volumeInfoComparator(lhs.volume(), rhs.volume());
         }