diff --git a/core/src/main/scala/org/scalajs/macrotaskexecutor/MacrotaskExecutor.scala b/core/src/main/scala/org/scalajs/macrotaskexecutor/MacrotaskExecutor.scala
index 33ac1b4..02f18ad 100644
--- a/core/src/main/scala/org/scalajs/macrotaskexecutor/MacrotaskExecutor.scala
+++ b/core/src/main/scala/org/scalajs/macrotaskexecutor/MacrotaskExecutor.scala
@@ -134,6 +134,20 @@ object MacrotaskExecutor extends ExecutionContextExecutor {
           channel.port2.postMessage(handle)
           ()
         }
+      } else if (
+        js.typeOf(
+          js.Dynamic.global.navigator
+        ) != Undefined && js.Dynamic.global.navigator.userAgent
+          .asInstanceOf[js.UndefOr[String]]
+          .exists(_.contains("jsdom"))
+      ) {
+        val setImmediate =
+          js.Dynamic.global.Node.constructor("return setImmediate")()
+
+        { k =>
+          setImmediate(k)
+          ()
+        }
       } else {
         // we don't try to look for process.nextTick since scalajs doesn't support old node
         // we're also not going to bother fast-pathing for IE6; just fall through
diff --git a/core/src/test/scala/org/scalajs/macrotaskexecutor/MacrotaskExecutorSuite.scala b/core/src/test/scala/org/scalajs/macrotaskexecutor/MacrotaskExecutorSuite.scala
index 883dd61..328f25b 100644
--- a/core/src/test/scala/org/scalajs/macrotaskexecutor/MacrotaskExecutorSuite.scala
+++ b/core/src/test/scala/org/scalajs/macrotaskexecutor/MacrotaskExecutorSuite.scala
@@ -32,15 +32,15 @@ class MacrotaskExecutorSuite extends FunSuite {
       else
         Future.unit.flatMap(_ => loop(n - 1)).map(_ + 1)
 
-    // val start = System.currentTimeMillis()
-    // val MinimumClamp = 10000 * 2 * 4    // HTML5 specifies a 4ms clamp (https://developer.mozilla.org/en-US/docs/Web/API/WindowTimers.setTimeout#Minimum.2F_maximum_delay_and_timeout_nesting)
+    val start = System.currentTimeMillis()
+    val MinimumClamp = 10000 * 2 * 4    // HTML5 specifies a 4ms clamp (https://developer.mozilla.org/en-US/docs/Web/API/WindowTimers.setTimeout#Minimum.2F_maximum_delay_and_timeout_nesting)
 
     loop(10000) flatMap { res =>
       Future {
-        // val end = System.currentTimeMillis()
+        val end = System.currentTimeMillis()
 
         assert(res == 10000)
-        // assert((end - start).toDouble / MinimumClamp < 0.25)   // we should beat the clamping by at least 4x even on slow environments
+        assert((end - start).toDouble / MinimumClamp < 0.25)   // we should beat the clamping by at least 4x even on slow environments
       }
     }
   }