diff --git a/weed/s3api/auth_signature_v4.go b/weed/s3api/auth_signature_v4.go
index 3bc5f6457..757016a55 100644
--- a/weed/s3api/auth_signature_v4.go
+++ b/weed/s3api/auth_signature_v4.go
@@ -49,7 +49,6 @@ const (
 	emptySHA256            = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
 	streamingContentSHA256 = "STREAMING-AWS4-HMAC-SHA256-PAYLOAD"
 	signV4ChunkedAlgorithm   = "AWS4-HMAC-SHA256-PAYLOAD"
-	streamingContentEncoding = "aws-chunked"
 
 	// http Header "x-amz-content-sha256" == "UNSIGNED-PAYLOAD" indicates that the
 	// client did not calculate sha256 of the payload.