diff --git a/README.md b/README.md
index b67f27861..1763abeb6 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,8 @@ const request = {
   body,
   headers,
   requestInterceptor,
-  responseInterceptor
+  responseInterceptor,
+  userFetch
 }
 
 Swagger.http(request)
@@ -98,6 +99,11 @@ Swagger.http({
   responseInterceptor: (res: Response) => Response
 })
 
+// Custom Fetch
+Swagger.http({
+  userFetch: (url: String, options: Object) => Promise
+})
+
 ```
 
 Swagger Specification Resolver
@@ -132,6 +138,7 @@ const params = {
   responseContentType,
 
   (http), // You can also override the HTTP client completely
+  (userFetch), // Alternatively you can just override the fetch method (if you want to use request.js or some other HttpAgent)
 }
 
 // Creates a request object compatible with HTTP client interface.
diff --git a/src/execute.js b/src/execute.js
index 29fe01e1d..6b59246bb 100755
--- a/src/execute.js
+++ b/src/execute.js
@@ -66,7 +66,7 @@ export function execute({
 export function buildRequest({
   spec, operationId, parameters, securities, requestContentType,
   responseContentType, parameterBuilders, scheme,
-  requestInterceptor, responseInterceptor, contextUrl
+  requestInterceptor, responseInterceptor, contextUrl, userFetch
 }) {
   parameterBuilders = parameterBuilders || PARAMETER_BUILDERS
 
@@ -87,6 +87,9 @@ export function buildRequest({
   if (responseInterceptor) {
     req.responseInterceptor = responseInterceptor
   }
+  if (userFetch) {
+    req.userFetch = userFetch
+  }
 
   // Mostly for testing
   if (!operationId) {
diff --git a/src/http.js b/src/http.js
index ae79f9600..4707733dd 100644
--- a/src/http.js
+++ b/src/http.js
@@ -37,7 +37,8 @@ export default function http(url, request = {}) {
     delete request.headers['Content-Type']
   }
 
-  return fetch(request.url, request).then((res) => { // eslint-disable-line no-undef
+  // eslint-disable-next-line no-undef
+  return (request.userFetch || fetch)(request.url, request).then((res) => {
     const serialized = self.serializeRes(res, url, request).then((_res) => {
       if (request.responseInterceptor) {
         _res = request.responseInterceptor(_res) || _res
diff --git a/src/interfaces.js b/src/interfaces.js
index df4914a84..979186ac2 100644
--- a/src/interfaces.js
+++ b/src/interfaces.js
@@ -18,7 +18,7 @@ export function makeExecute(swaggerJs = {}) {
   return ({pathName, method, operationId}) => (parameters, opts = {}) => {
     return swaggerJs.execute({
       spec: swaggerJs.spec,
-      ...pick(swaggerJs, 'requestInterceptor', 'responseInterceptor'),
+      ...pick(swaggerJs, 'requestInterceptor', 'responseInterceptor', 'userFetch'),
       pathName,
       method,
       parameters,
diff --git a/test/execute.js b/test/execute.js
index 92e3407b3..c5e82bfb2 100644
--- a/test/execute.js
+++ b/test/execute.js
@@ -130,6 +130,37 @@ describe('execute', () => {
       })
     })
 
+    it('should execute a simple get request with user-defined fetch', () => {
+      // Given
+      const spec = {
+        host: 'swagger.io',
+        schemes: ['https'],
+        paths: {
+          '/one': {
+            get: {
+              operationId: 'getMe'
+            }
+          }
+        }
+      }
+
+      const spy = createSpy().andReturn(Promise.resolve())
+
+      execute({
+        userFetch: spy,
+        spec,
+        operationId: 'getMe'
+      })
+      expect(spy.calls.length).toEqual(1)
+      expect(spy.calls[0].arguments[1]).toEqual({
+        method: 'GET',
+        url: 'https://swagger.io/one',
+        credentials: 'same-origin',
+        headers: { },
+        userFetch: spy
+      })
+    })
+
     it('should include values for query parameters', function () {
       // Given
       const spec = {