diff --git a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/search/aggregation/SingleFieldAggregationBaseIT.java b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/search/aggregation/SingleFieldAggregationBaseIT.java
index b804ab83741..6121ed3bef3 100644
--- a/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/search/aggregation/SingleFieldAggregationBaseIT.java
+++ b/integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/search/aggregation/SingleFieldAggregationBaseIT.java
@@ -60,7 +60,7 @@
 @RunWith(Parameterized.class)
 public class SingleFieldAggregationBaseIT<F> {
 
-	private static final int INIT_BATCH_SIZE = 1000;
+	private static final int INIT_BATCH_SIZE = 500;
 
 	private static final String AGGREGATION_NAME = "aggregationName";