diff --git a/.golangci.yml b/.golangci.yml
index 1766f14..b323ff5 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -7,7 +7,7 @@ linters:
     #- revive
     - ineffassign
     - govet
-    #- unconvert
+    - unconvert
     #- staticcheck
     - gosimple
     - stylecheck
diff --git a/uploader.go b/uploader.go
index 9ca8b43..b213261 100644
--- a/uploader.go
+++ b/uploader.go
@@ -459,7 +459,7 @@ func (mpu *multipartUpload) AddPart(partNumber int, at time.Time, body []byte) (
 	// What the ETag actually is is not specified, so let's just invent any old thing
 	// from guaranteed unique input:
 	hash := md5.New()
-	hash.Write([]byte(body))
+	hash.Write(body)
 	etag = fmt.Sprintf(`"%s"`, hex.EncodeToString(hash.Sum(nil)))
 
 	part := multipartUploadPart{