diff --git a/src/main/java/com/fanruan/fs/s3/repository/core/S3ResourceRepository.java b/src/main/java/com/fanruan/fs/s3/repository/core/S3ResourceRepository.java
index f8d05b3..c6edea8 100644
--- a/src/main/java/com/fanruan/fs/s3/repository/core/S3ResourceRepository.java
+++ b/src/main/java/com/fanruan/fs/s3/repository/core/S3ResourceRepository.java
@@ -175,15 +175,15 @@ public class S3ResourceRepository extends BaseResourceRepository {
                     metadata = s3.getObjectMetadata(bucket, path);
                 } catch (Exception ignore) {
                 }
-            }
-            if (metadata == null) {
-                metadata = new ObjectMetadata();
-                String mimeType = URLConnection.guessContentTypeFromName(path);
-                if (mimeType != null) {
-                    metadata.setContentType(mimeType);
+                if (metadata == null) {
+                    metadata = new ObjectMetadata();
+                    String mimeType = URLConnection.guessContentTypeFromName(path);
+                    if (mimeType != null) {
+                        metadata.setContentType(mimeType);
+                    }
                 }
+                metadata.setContentLength(length);
             }
-            metadata.setContentLength(length);
             s3.putObject(bucket, path, new ByteArrayInputStream(data), metadata);
         }
     }