diff --git a/server/src/test/java/org/elasticsearch/cluster/allocation/ClusterRerouteIT.java b/server/src/test/java/org/elasticsearch/cluster/allocation/ClusterRerouteIT.java
index d629804b02d58..162d1059b3ab2 100644
--- a/server/src/test/java/org/elasticsearch/cluster/allocation/ClusterRerouteIT.java
+++ b/server/src/test/java/org/elasticsearch/cluster/allocation/ClusterRerouteIT.java
@@ -22,6 +22,7 @@
 import org.apache.logging.log4j.Level;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.apache.lucene.util.LuceneTestCase;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse;
 import org.elasticsearch.action.admin.cluster.reroute.ClusterRerouteResponse;
 import org.elasticsearch.action.admin.cluster.reroute.TransportClusterRerouteAction;
@@ -74,6 +75,8 @@
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.hasSize;
 
+// testDelayWithALargeAmountOfShards does a lot of cluster state updates, and WindowsFS slows it down too much (#52000)
+@LuceneTestCase.SuppressFileSystems(value = "WindowsFS")
 @ClusterScope(scope = Scope.TEST, numDataNodes = 0)
 public class ClusterRerouteIT extends ESIntegTestCase {
     private final Logger logger = LogManager.getLogger(ClusterRerouteIT.class);