diff --git a/backend/posix/posix.go b/backend/posix/posix.go
index f34446cb..b136a7a0 100644
--- a/backend/posix/posix.go
+++ b/backend/posix/posix.go
@@ -1271,12 +1271,23 @@ func (p *Posix) createObjVersion(bucket, key string, size int64, acc auth.Accoun
 	}
 	defer f.cleanup()
 
+	originalMTime := time.Now()
+	if srcInfo, err := sf.Stat(); err == nil {
+		originalMTime = srcInfo.ModTime()
+	}
+
 	// Prioritize copy_file_range for internal file-to-file version copies.
 	_, err = io.Copy(f.File(), sf)
 	if err != nil {
 		return versionPath, err
 	}
 
+	// Restore original mtime after copy
+	err = os.Chtimes(f.File().Name(), time.Now(), originalMTime)
+	if err != nil {
+		return versionPath, err
+	}
+
 	versionPath = filepath.Join(versionBucketPath, versioningKey)
 
 	err = os.MkdirAll(filepath.Join(versionBucketPath, genObjVersionKey(key)), p.newDirPerm)