diff --git a/src/test/java/org/elasticsearch/index/store/StoreTest.java b/src/test/java/org/elasticsearch/index/store/StoreTest.java
index 60ed4eb8c1d..c1199f09a66 100644
--- a/src/test/java/org/elasticsearch/index/store/StoreTest.java
+++ b/src/test/java/org/elasticsearch/index/store/StoreTest.java
@@ -45,6 +45,7 @@ import org.junit.Test;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.nio.file.Files;
 import java.nio.file.NoSuchFileException;
 import java.util.*;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -697,7 +698,7 @@ public class StoreTest extends ElasticsearchTestCase {
 
     public static void assertConsistent(Store store, Store.MetadataSnapshot metadata) throws IOException {
         for (String file : store.directory().listAll()) {
-            if (!IndexWriter.WRITE_LOCK_NAME.equals(file) && !IndexFileNames.OLD_SEGMENTS_GEN.equals(file) && !Store.isChecksum(file)) {
+            if (!IndexWriter.WRITE_LOCK_NAME.equals(file) && !IndexFileNames.OLD_SEGMENTS_GEN.equals(file) && !Store.isChecksum(file) && file.startsWith("extra") == false) {
                 assertTrue(file + " is not in the map: " + metadata.asMap().size() + " vs. " + store.directory().listAll().length, metadata.asMap().containsKey(file));
             } else {
                 assertFalse(file + " is not in the map: " + metadata.asMap().size() + " vs. " + store.directory().listAll().length, metadata.asMap().containsKey(file));