diff --git a/fs/s3_adapter.go b/fs/s3_adapter.go
index f7455d8..9788ba1 100644
--- a/fs/s3_adapter.go
+++ b/fs/s3_adapter.go
@@ -53,8 +53,8 @@ func (s *S3Adapter) GetFileList(ctx context.Context, dirPath string, relDt time.
 
 	span.SetAttributes(attribute.String("path", dirPath))
 	span.SetAttributes(attribute.String("relativeDate", relDt.Format("2006-01-02")))
-	key := fmt.Sprintf("%s_%s", dirPath, relDt.Format("2006-01-02"))
-	if cachedInterface, ok := s.cache.Load(key); ok {
+	cacheKey := fmt.Sprintf("%s_%s", dirPath, relDt.Format("2006-01-02"))
+	if cachedInterface, ok := s.cache.Load(cacheKey); ok {
 		cachedItem := cachedInterface.(cacheItem)
 		if time.Now().Before(cachedItem.expires) {
 			span.SetAttributes(attribute.Bool("cache.hit", true))
@@ -62,7 +62,7 @@ func (s *S3Adapter) GetFileList(ctx context.Context, dirPath string, relDt time.
 		}
 	}
 
-	mutexKey := fmt.Sprintf("lock_%s", key)
+	mutexKey := fmt.Sprintf("lock_%s", cacheKey)
 	mutex, _ := s.cache.LoadOrStore(mutexKey, &sync.Mutex{})
 	lock := mutex.(*sync.Mutex)
 	defer func() {
@@ -72,7 +72,7 @@ func (s *S3Adapter) GetFileList(ctx context.Context, dirPath string, relDt time.
 	}()
 	lock.Lock()
 
-	if cachedInterface, ok := s.cache.Load(key); ok {
+	if cachedInterface, ok := s.cache.Load(cacheKey); ok {
 		cachedItem := cachedInterface.(cacheItem)
 		if time.Now().Before(cachedItem.expires) {
 			span.SetAttributes(attribute.Bool("cache.hit", true))
@@ -168,7 +168,7 @@ func (s *S3Adapter) GetFileList(ctx context.Context, dirPath string, relDt time.
 		data:    fileList,
 		expires: time.Now().Add(10 * time.Second),
 	}
-	s.cache.Store(key, cacheItem)
+	s.cache.Store(cacheKey, cacheItem)
 
 	return fileList, nil
 }