diff --git a/extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/SketchAggregationWithSimpleDataTest.java b/extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/SketchAggregationWithSimpleDataTest.java
index b5cb8f24abc..fc9846e9a5c 100644
--- a/extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/SketchAggregationWithSimpleDataTest.java
+++ b/extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/SketchAggregationWithSimpleDataTest.java
@@ -37,6 +37,7 @@ import org.apache.druid.query.groupby.ResultRow;
 import org.apache.druid.query.timeseries.TimeseriesResultValue;
 import org.apache.druid.query.topn.DimensionAndMetricValueExtractor;
 import org.apache.druid.query.topn.TopNResultValue;
+import org.apache.druid.testing.InitializedNullHandlingTest;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Rule;
@@ -56,7 +57,7 @@ import java.util.List;
  *
  */
 @RunWith(Parameterized.class)
-public class SketchAggregationWithSimpleDataTest
+public class SketchAggregationWithSimpleDataTest extends InitializedNullHandlingTest
 {
   @Rule
   public final TemporaryFolder tempFolder = new TemporaryFolder();
diff --git a/extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/oldapi/OldApiSketchAggregationTest.java b/extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/oldapi/OldApiSketchAggregationTest.java
index d732e8f7827..dee56ef6ce7 100644
--- a/extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/oldapi/OldApiSketchAggregationTest.java
+++ b/extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/oldapi/OldApiSketchAggregationTest.java
@@ -40,6 +40,7 @@ import org.apache.druid.query.groupby.GroupByQueryRunnerTest;
 import org.apache.druid.query.groupby.ResultRow;
 import org.apache.druid.query.groupby.epinephelinae.GrouperTestUtil;
 import org.apache.druid.query.groupby.epinephelinae.TestColumnSelectorFactory;
+import org.apache.druid.testing.InitializedNullHandlingTest;
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Rule;
@@ -59,7 +60,7 @@ import java.util.List;
  *
  */
 @RunWith(Parameterized.class)
-public class OldApiSketchAggregationTest
+public class OldApiSketchAggregationTest extends InitializedNullHandlingTest
 {
   private final AggregationTestHelper helper;