diff --git a/lib/transports/http.js b/lib/transports/http.js
index d7cb717..2298dc1 100644
--- a/lib/transports/http.js
+++ b/lib/transports/http.js
@@ -104,11 +104,39 @@ class HTTPTransport {
 
     let parsedUrl = urlTemplate.parse(link.url)
     parsedUrl = parsedUrl.expand(pathParams)
-    parsedUrl = new URL(parsedUrl)
-    parsedUrl.set('query', queryParams)
+    parsedUrl = new URL(parsedUrl, null, true)
+    parsedUrl.set('query', Object.assign(parsedUrl.query, queryParams))
+
+    // Modified querystringify to parse lists into repeated querystring keys
+    function querystringify (obj, prefix) {
+      var has = Object.prototype.hasOwnProperty
+      prefix = prefix || ''
+
+      var pairs = []
+
+      //
+      // Optionally prefix with a '?' if needed
+      //
+      if (typeof prefix !== 'string') prefix = '?'
+
+      for (var key in obj) {
+        if (has.call(obj, key)) {
+          let value = obj[key]
+          if (Array.isArray(value)) {
+            for (let item of value) {
+              pairs.push(encodeURIComponent(key) + '=' + encodeURIComponent(item))
+            }
+          } else {
+            pairs.push(encodeURIComponent(key) + '=' + encodeURIComponent(value))
+          }
+        }
+      }
+
+      return pairs.length ? prefix + pairs.join('&') : ''
+    }
 
     return {
-      url: parsedUrl.toString(),
+      url: parsedUrl.toString(querystringify),
       options: requestOptions
     }
   }
diff --git a/tests/transports/http.js b/tests/transports/http.js
index a92e3ec..a7c09cc 100644
--- a/tests/transports/http.js
+++ b/tests/transports/http.js
@@ -108,6 +108,42 @@ describe('Test the HTTPTransport', function () {
       })
   })
 
+  it('should check the action function of an HTTP transport (json) with query params and existing querystring in url', function () {
+    const url = 'http://www.example.com/?next=2'
+    const fields = [new document.Field('page', false, 'query')]
+    const link = new document.Link(url, 'get', 'application/json', fields)
+    const transport = new transports.HTTPTransport({
+      fetch: testUtils.echo
+    })
+    const params = {
+      page: 23
+    }
+
+    return transport.action(link, decoders, params)
+      .then((res) => {
+        expect(res.url).toMatch(/http:\/\/www.example.com\/\?(page=23&(?=next=2)|next=2&(?=page=23))/)
+        expect(res).toHaveProperty('headers', {})
+        expect(res).toHaveProperty('method', 'GET')
+      })
+  })
+
+  it('should check the action function of an HTTP transport (json) with list-type query params', function () {
+    const url = 'http://www.example.com/'
+    const fields = [new document.Field('pages', false, 'query')]
+    const link = new document.Link(url, 'get', 'application/json', fields)
+    const transport = new transports.HTTPTransport({
+      fetch: testUtils.echo
+    })
+    const params = {
+      pages: [22, 23]
+    }
+
+    return transport.action(link, decoders, params)
+      .then((res) => {
+        expect(res).toEqual({url: 'http://www.example.com/?pages=22&pages=23', headers: {}, method: 'GET'})
+      })
+  })
+
   it('should check the action function of an HTTP transport (json) with path params', function () {
     const url = 'http://www.example.com/{user}/'
     const fields = [new document.Field('user', true, 'path')]
@@ -244,6 +280,21 @@ describe('Test the HTTPTransport', function () {
       })
   })
 
+  it('should check the action function of an HTTP transport (json) with querystring in url and missing optional query params', function () {
+    const url = 'http://www.example.com/?next=1'
+    const fields = [new document.Field('page', false, 'query')]
+    const link = new document.Link(url, 'get', 'application/json', fields)
+    const transport = new transports.HTTPTransport({
+      fetch: testUtils.echo
+    })
+    const params = {}
+
+    return transport.action(link, decoders, params)
+      .then((res) => {
+        expect(res).toEqual({url: 'http://www.example.com/?next=1', headers: {}, method: 'GET'})
+      })
+  })
+
   it('should check the action function of an HTTP transport (json) with missing required parameter', function () {
     const url = 'http://www.example.com/{user}/'
     const fields = [new document.Field('user', true, 'path')]