diff --git a/lib/util.js b/lib/util.js
index f059f2e..3917be4 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -24,7 +24,7 @@ export function toNameValuePairs(object) {
 }
 export function parseUrlEncoded(data) {
   const params = parse(`?${data}`, true).query;
-  return this.toNameValuePairs(params);
+  return toNameValuePairs(params);
 }
 export function parsePostData(contentType, postData) {
   if (isEmpty(contentType) || isEmpty(postData)) {
@@ -35,13 +35,13 @@ export function parsePostData(contentType, postData) {
     if (/^application\/x-www-form-urlencoded/.test(contentType)) {
       return {
         mimeType: contentType,
-        params: this.parseUrlEncoded(postData)
+        params: parseUrlEncoded(postData)
       };
     }
     if (/^application\/json/.test(contentType)) {
       return {
         mimeType: contentType,
-        params: this.toNameValuePairs(JSON.parse(postData))
+        params: toNameValuePairs(JSON.parse(postData))
       };
     }
     // FIXME parse multipart/form-data as well.