diff --git a/core/src/test/java/org/infinispan/commons/util/concurrent/NotifyingFutureTest.java b/core/src/test/java/org/infinispan/commons/util/concurrent/NotifyingFutureTest.java
index 80fc2704934d..be7baff7699e 100644
--- a/core/src/test/java/org/infinispan/commons/util/concurrent/NotifyingFutureTest.java
+++ b/core/src/test/java/org/infinispan/commons/util/concurrent/NotifyingFutureTest.java
@@ -38,6 +38,7 @@ public void testDoneOtherThread1() throws ExecutionException, InterruptedExcepti
       testDoneOtherThread(100, 0);
    }
 
+   @Test(groups = "unstable", description = "See ISPN-4029")
    public void testDoneOtherThread2() throws ExecutionException, InterruptedException {
       testDoneOtherThread(0, 100);
    }
@@ -47,6 +48,7 @@ public void testExceptionOtherThread1() throws ExecutionException, InterruptedEx
       testExceptionOtherThread(100, 0);
    }
 
+   @Test(groups = "unstable", description = "See ISPN-4029")
    public void testExceptionOtherThread2() throws ExecutionException, InterruptedException {
       testExceptionOtherThread(0, 100);
    }