diff --git a/core/src/test/java/org/elasticsearch/index/shard/IndexShardTests.java b/core/src/test/java/org/elasticsearch/index/shard/IndexShardTests.java
index 60bb7acfde6..af0f93b57b2 100644
--- a/core/src/test/java/org/elasticsearch/index/shard/IndexShardTests.java
+++ b/core/src/test/java/org/elasticsearch/index/shard/IndexShardTests.java
@@ -331,6 +331,7 @@ public class IndexShardTests extends ESSingleNodeTestCase {
     }
 
     @TestLogging("indices.flush:TRACE,index.shard:TRACE,index.engine:TRACE")
+    @AwaitsFix(bugUrl = "simonw is working on this")
     public void testMarkAsInactiveTriggersSyncedFlush() throws Exception {
         assertAcked(client().admin().indices().prepareCreate("test")
                 .setSettings(SETTING_NUMBER_OF_SHARDS, 1, SETTING_NUMBER_OF_REPLICAS, 0, IndexShard.INDEX_SHARD_INACTIVE_TIME_SETTING, "0s"));