diff --git a/server/src/test/java/org/elasticsearch/index/query/PrefixQueryBuilderTests.java b/server/src/test/java/org/elasticsearch/index/query/PrefixQueryBuilderTests.java
index 458eb60e5039d..d80ae19015ee5 100644
--- a/server/src/test/java/org/elasticsearch/index/query/PrefixQueryBuilderTests.java
+++ b/server/src/test/java/org/elasticsearch/index/query/PrefixQueryBuilderTests.java
@@ -224,10 +224,8 @@ public void testPrefixCircuitBreakerTripsWithLowLimit() {
         assertCircuitBreakerTripsOnQueryConstruction("500kb", () -> {
             BoolQueryBuilder boolQuery = new BoolQueryBuilder();
             IntStream.range(0, 100).forEach(i -> {
-                PrefixQueryBuilder prefixQuery = new PrefixQueryBuilder(TEXT_FIELD_NAME, "prefix" + i);
-                if (randomBoolean()) {
-                    prefixQuery.caseInsensitive(true);
-                }
+                String longPrefix = "prefixpattern" + i + "_repeatsegment_repeatsegment_repeatsegment_repeatsegment_repeatsegment";
+                PrefixQueryBuilder prefixQuery = new PrefixQueryBuilder(TEXT_FIELD_NAME, longPrefix).caseInsensitive(true);
                 boolQuery.should(prefixQuery);
             });
             return boolQuery;