diff --git a/cmd/bucket-handlers.go b/cmd/bucket-handlers.go
index bb7200212..60fad18ae 100644
--- a/cmd/bucket-handlers.go
+++ b/cmd/bucket-handlers.go
@@ -1420,7 +1420,7 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 	if formValues.Get(postPolicyBucketTagging) != "" {
 		tags, err := tags.ParseObjectXML(strings.NewReader(formValues.Get(postPolicyBucketTagging)))
 		if err != nil {
-			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
+			writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMalformedPOSTRequest), r.URL)
 			return
 		}
 		tagsStr := tags.String()