diff --git a/tck/src/test/java/org/reactivestreams/tck/PublisherVerificationTest.java b/tck/src/test/java/org/reactivestreams/tck/PublisherVerificationTest.java
index 54ba97b5..5e93a3b5 100644
--- a/tck/src/test/java/org/reactivestreams/tck/PublisherVerificationTest.java
+++ b/tck/src/test/java/org/reactivestreams/tck/PublisherVerificationTest.java
@@ -264,7 +264,7 @@ public void required_spec109_subscribeThrowNPEOnNullSubscriber_shouldFailIfDoesn
   }
 
   @Test
-  public void optional_spec109_mayRejectCallsToSubscribeIfPublisherIsUnableOrUnwillingToServeThemRejectionMustTriggerOnErrorAfterOnSubscribe_actuallyPass() throws Throwable {
+  public void required_spec109_mayRejectCallsToSubscribeIfPublisherIsUnableOrUnwillingToServeThemRejectionMustTriggerOnErrorAfterOnSubscribe_actuallyPass() throws Throwable {
     customPublisherVerification(SKIP, new Publisher<Integer>() {
       @Override public void subscribe(Subscriber<? super Integer> s) {
         s.onSubscribe(new NoopSubscription());