diff --git a/akka-stream-testkit/src/test/scala/akka/stream/testkit/StreamTestKitSpec.scala b/akka-stream-testkit/src/test/scala/akka/stream/testkit/StreamTestKitSpec.scala
index 431842af4d..72022d8485 100644
--- a/akka-stream-testkit/src/test/scala/akka/stream/testkit/StreamTestKitSpec.scala
+++ b/akka-stream-testkit/src/test/scala/akka/stream/testkit/StreamTestKitSpec.scala
@@ -145,12 +145,13 @@ class StreamTestKitSpec extends AkkaSpec {
     "#expectNextWithTimeoutPF should fail after timeout when element delayed" in {
       intercept[AssertionError] {
         val timeout = 100.millis
-        val overTimeout = timeout + (10.millis)
+        val overTimeout = timeout + 50.millis
         Source.tick(overTimeout, 1.millis, 1).runWith(TestSink.probe)
           .request(1)
           .expectNextWithTimeoutPF(timeout, {
             case 1 ⇒
           })
+
       }.getMessage should include("timeout")
     }