diff --git a/server/src/main/java/org/elasticsearch/indices/IndicesQueryCache.java b/server/src/main/java/org/elasticsearch/indices/IndicesQueryCache.java
index 1dfbc3af42b49..814288dbe588f 100644
--- a/server/src/main/java/org/elasticsearch/indices/IndicesQueryCache.java
+++ b/server/src/main/java/org/elasticsearch/indices/IndicesQueryCache.java
@@ -206,7 +206,7 @@ QueryCacheStats toQueryCacheStats() {
     }
 
     private static class StatsAndCount {
-        int count;
+        volatile int count;
         final Stats stats;
 
         StatsAndCount(Stats stats) {