diff --git a/lib/configuration.js b/lib/configuration.js
index e284baf..ed73a1f 100755
--- a/lib/configuration.js
+++ b/lib/configuration.js
@@ -235,7 +235,7 @@ function readCookie(hexStr) {
 
 function readCookieFile(path) {
   try {
-    return readCookie(readFileSync(path, 'ascii').trim());
+    return readCookie(readFileSync(path, 'hex'));
   } catch (ex) {
     return null;
   }