diff --git a/lib/core/dispatchRequest.js b/lib/core/dispatchRequest.js
index 7768e00..c8267ad 100644
--- a/lib/core/dispatchRequest.js
+++ b/lib/core/dispatchRequest.js
@@ -43,9 +43,7 @@ module.exports = function dispatchRequest(config) {
   utils.forEach(
     ['delete', 'get', 'head', 'post', 'put', 'patch', 'common'],
     function cleanHeaderConfig(method) {
-      if (typeof config.headers[method] !== 'string') {
-        delete config.headers[method];
-      }
+      delete config.headers[method];
     }
   );
 
diff --git a/test/specs/headers.spec.js b/test/specs/headers.spec.js
index 6c2aba3..5a8b1a8 100644
--- a/test/specs/headers.spec.js
+++ b/test/specs/headers.spec.js
@@ -86,17 +86,4 @@ describe('headers', function () {
       done();
     });
   });
-
-  describe('when a header key matches an HTTP verb', function() {
-    it('preserves the header value', function(done) {
-      axios.post('/foo', null, { 'headers': { 'delete': 'test' } });
-
-      getAjaxRequest().then(function (request) {
-        var headerValue = request.requestHeaders['delete'];
-
-        expect(headerValue).toEqual('test');
-        done();
-      });
-    });
-  });
 });