diff --git a/HISTORY.md b/HISTORY.md
index 5f69004..c70518f 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,6 +1,7 @@
 unreleased
 ==================
 
+* Remove `setImmediate` support check
 * Remove `Object.setPrototypeOf` polyfill
 * Use `Array.flat` instead of `array-flatten` package
 * Replace `methods` dependency with standard library
diff --git a/lib/route.js b/lib/route.js
index ec98414..0b25910 100644
--- a/lib/route.js
+++ b/lib/route.js
@@ -24,11 +24,6 @@ const slice = Array.prototype.slice
 const flatten = Array.prototype.flat
 const methods = METHODS.map((method) => method.toLowerCase())
 
-/* istanbul ignore next */
-const defer = typeof setImmediate === 'function'
-  ? setImmediate
-  : function (fn) { process.nextTick(fn.bind.apply(fn, arguments)) }
-
 /**
  * Expose `Route`.
  */
@@ -137,7 +132,7 @@ Route.prototype.dispatch = function dispatch (req, res, done) {
 
     // max sync stack
     if (++sync > 100) {
-      return defer(next, err)
+      return setImmediate(next, err)
     }
 
     let layer