diff --git a/.travis.yml b/.travis.yml
index 3939a237..a183732a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,6 +16,7 @@ script:
   - npm run demo6
   - npm run demo7
   - START_SERVER_AND_TEST_INSECURE=1 npm run demo9
+  - npm run demo11
   - npm run demo-cross-env
 after_success:
   - npm run travis-deploy-once "npm run semantic-release"
diff --git a/bin/start.js b/bin/start.js
index 58a9ffca..7e7060bd 100755
--- a/bin/start.js
+++ b/bin/start.js
@@ -8,6 +8,7 @@ const utils = require('../src/utils')
 let start = 'start'
 let test = 'test'
 let url
+let interval = 2000
 
 if (args.length === 1 && utils.isUrlOrPort(args[0])) {
   // passed just single url or port number, for example
@@ -26,18 +27,26 @@ if (args.length === 1 && utils.isUrlOrPort(args[0])) {
     start = args[0]
     url = utils.normalizeUrl(args[1])
   }
-} else {
-  la(args.length === 3, 'expect: <start script name> <url> <test script name>')
+} else if (args.length <= 4) {
   start = args[0]
   url = utils.normalizeUrl(args[1])
   test = args[2]
+
+  if (args.length === 4) {
+    interval = args[3]
+  }
+} else {
+  la(
+    false,
+    'expect: <start script name> <url> <test script name> <interval optional number>'
+  )
 }
 
 console.log(`starting server using command "npm run ${start}"`)
 console.log(`and when url "${url}" is responding`)
 console.log(`running tests using command "${test}"`)
 
-startAndTest({ start, url, test }).catch(e => {
+startAndTest({ start, url, test, interval }).catch(e => {
   console.error(e)
   process.exit(1)
 })
diff --git a/package.json b/package.json
index 90d01582..66c7a006 100644
--- a/package.json
+++ b/package.json
@@ -90,6 +90,7 @@
     "demo8": "node bin/start.js start-multiple \":9000|:9001\" test3",
     "demo9": "node bin/start.js start-https \"https://127.0.0.1:9000\" test4",
     "demo10": "node bin/start.js start-fail http://127.0.0.1:9000 test",
+    "demo11": "node bin/start.js start http://127.0.0.1:9000 test2 1000",
     "demo-cross-env": "node bin/start.js start-cross-env 9000",
     "travis-deploy-once": "travis-deploy-once"
   },
diff --git a/src/index.js b/src/index.js
index 70c66001..cac42e18 100644
--- a/src/index.js
+++ b/src/index.js
@@ -13,7 +13,7 @@ const isDebug = () =>
 
 const isInsecure = () => process.env.START_SERVER_AND_TEST_INSECURE
 
-function startAndTest ({ start, url, test }) {
+function startAndTest ({ start, url, test, interval }) {
   la(is.unemptyString(start), 'missing start script name', start)
   la(is.unemptyString(test), 'missing test script name', test)
   la(
@@ -66,7 +66,7 @@ function startAndTest ({ start, url, test }) {
     waitOn(
       {
         resources: Array.isArray(url) ? url : [url],
-        interval: 2000,
+        interval: interval,
         window: 1000,
         verbose: isDebug(),
         strictSSL: !isInsecure(),