diff --git a/spark/src/test/scala/org/apache/spark/sql/CometTPCHQuerySuite.scala b/spark/src/test/scala/org/apache/spark/sql/CometTPCHQuerySuite.scala
index b92ab0d7d9..0f94292709 100644
--- a/spark/src/test/scala/org/apache/spark/sql/CometTPCHQuerySuite.scala
+++ b/spark/src/test/scala/org/apache/spark/sql/CometTPCHQuerySuite.scala
@@ -91,7 +91,7 @@ class CometTPCHQuerySuite extends QueryTest with TPCBase with ShimCometTPCHQuery
     conf.set(CometConf.COMET_NATIVE_SCAN_ENABLED.key, "true")
     conf.set(CometConf.COMET_SHUFFLE_ENABLED.key, "true")
     conf.set(MEMORY_OFFHEAP_ENABLED.key, "true")
-    conf.set(MEMORY_OFFHEAP_SIZE.key, "4g")
+    conf.set(MEMORY_OFFHEAP_SIZE.key, "2g")
   }
 
   protected override def createSparkSession: TestSparkSession = {