diff --git a/lib/strategy.js b/lib/strategy.js
index cb96a24..d383573 100644
--- a/lib/strategy.js
+++ b/lib/strategy.js
@@ -52,14 +52,14 @@ function Strategy(options, verify) {
   
   if (!verify) throw new Error('token authentication strategy requires a verify function');
   
-  this._usernameHeader = options.usernameHeader ? options.usernameHeader.toLowerCase() : 'x-username';
-  this._tokenHeader    = options.tokenHeader ? options.tokenHeader.toLowerCase()    : 'x-token';
+  this._usernameHeader = options.usernameHeader ? options.usernameHeader : 'x-username';
+  this._tokenHeader    = options.tokenHeader ? options.tokenHeader : 'x-token';
   
-  this._usernameField = options.usernameField ? options.usernameField.toLowerCase() : 'username';
-  this._tokenField    = options.tokenField ? options.tokenField.toLowerCase()    : 'token';
+  this._usernameField = options.usernameField ? options.usernameField : 'username';
+  this._tokenField    = options.tokenField ? options.tokenField : 'token';
 
-  this._usernameQuery = options.usernameQuery ? options.usernameQuery.toLowerCase() : this._usernameField;
-  this._tokenQuery    = options.tokenQuery ? options.tokenQuery.toLowerCase()    : this._tokenField;
+  this._usernameQuery = options.usernameQuery ? options.usernameQuery : this._usernameField;
+  this._tokenQuery    = options.tokenQuery ? options.tokenQuery : this._tokenField;
   
   passport.Strategy.call(this);
   this.name = 'token';