diff --git a/index.js b/index.js
index 4ffc318..6001290 100644
--- a/index.js
+++ b/index.js
@@ -98,14 +98,3 @@ Timestring.prototype.parse = function parse(string, returnUnit) {
     convert.call(this, totalSeconds, returnUnit) :
     totalSeconds;
 };
-
-/**
- * Parse a timestring
- *
- * @param  {string} unit
- * @param  {Object} opts
- * @return {string}
- */
-String.prototype.parseTime = function parseTime(unit, opts) {
-  return (new Timestring(opts)).parse(this, unit);
-};
diff --git a/test.js b/test.js
index 2e3f2fd..4ffb60e 100644
--- a/test.js
+++ b/test.js
@@ -46,18 +46,4 @@ describe('timestring', function() {
   it('can parse a messy time string', function() {
     expect((new timestring()).parse('5   D a YS    4 h   2 0     mI  nS')).to.equal(447600);
   });
-
-  it('should expose a method on String.prototype that will parse the string as a timestring', function(){
-    var str = '1min';
-
-    // no arguments passed
-    expect(str.parseTime()).to.equal(60);
-
-    // units argument passed
-    expect(str.parseTime('m')).to.equal(1);
-
-    // units + options argument passed
-    str = '5h';
-    expect(str.parseTime('d', { hoursPerDay: 5 })).to.equal(1);
-  });
 });