diff --git a/akka-docs/rst/project/migration-guide-2.3.x-2.4.x.rst b/akka-docs/rst/project/migration-guide-2.3.x-2.4.x.rst
index 19f45cfd78..f88000d4bd 100644
--- a/akka-docs/rst/project/migration-guide-2.3.x-2.4.x.rst
+++ b/akka-docs/rst/project/migration-guide-2.3.x-2.4.x.rst
@@ -140,3 +140,11 @@ in order to allow package level log level definitions and ease source code looku
 In case you used specific "simple" logger name based rules in your ``logback.xml`` configurations,
 please change them to reflect appropriate package name, such as
 ``<logger name='akka.cluster' level='warn' />`` or ``<logger name='akka.remote' level='error' />``
+
+Default interval for TestKit.awaitAssert changed to 100 ms
+==========================================================
+
+Default check interval changed from 800 ms to 100 ms. You can define the interval explicitly if you need a
+longer interval.
+
+
diff --git a/akka-testkit/src/main/scala/akka/testkit/TestKit.scala b/akka-testkit/src/main/scala/akka/testkit/TestKit.scala
index 4820f54ded..3663145474 100644
--- a/akka-testkit/src/main/scala/akka/testkit/TestKit.scala
+++ b/akka-testkit/src/main/scala/akka/testkit/TestKit.scala
@@ -254,7 +254,7 @@ trait TestKitBase {
    * Note that the timeout is scaled using Duration.dilated,
    * which uses the configuration entry "akka.test.timefactor".
    */
-  def awaitAssert(a: ⇒ Any, max: Duration = Duration.Undefined, interval: Duration = 800.millis) {
+  def awaitAssert(a: ⇒ Any, max: Duration = Duration.Undefined, interval: Duration = 100.millis) {
     val _max = remainingOrDilated(max)
     val stop = now + _max