diff --git a/src/index.js b/src/index.js
index b02f3fb1..473ee379 100644
--- a/src/index.js
+++ b/src/index.js
@@ -169,13 +169,16 @@ class Route {
   }
 }
 
-const toQuerystring = obj => Object.keys(obj).map(key => {
-  let value = obj[key]
-  if (Array.isArray(value)) {
-    value = value.join('/')
-  }
-  return [
-    encodeURIComponent(key),
-    encodeURIComponent(value)
-  ].join('=')
-}).join('&')
+const toQuerystring = obj => Object.keys(obj)
+  .filter(key => obj[key] !== null && obj[key] !== undefined)
+  .map(key => {
+    let value = obj[key]
+
+    if (Array.isArray(value)) {
+      value = value.join('/')
+    }
+    return [
+      encodeURIComponent(key),
+      encodeURIComponent(value)
+    ].join('=')
+  }).join('&')
diff --git a/test/index.test.js b/test/index.test.js
index fc69187d..84d2cb4e 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -74,6 +74,14 @@ describe('Routes', () => {
     expect(setup('a').route.getUrls()).toEqual({as: '/a', href: '/a?'})
   })
 
+  test('do not pass "null" for params that have null values', () => {
+    const {route} = setup('a', '/a/:b/:c?')
+    const params = {b: 'b', c: null, d: undefined}
+    const expected = {as: '/a/b?', href: '/a?b=b'}
+    expect(route.getUrls(params)).toEqual(expected)
+    expect(setup('a').route.getUrls()).toEqual({as: '/a', href: '/a?'})
+  })
+
   test('ensure "as" when path match is empty', () => {
     expect(setup('a', '/:a?').route.getAs()).toEqual('/')
   })