diff --git a/indexing-service/src/main/java/org/apache/druid/indexing/common/task/KillUnusedSegmentsTask.java b/indexing-service/src/main/java/org/apache/druid/indexing/common/task/KillUnusedSegmentsTask.java
index c0716442313..d186a9770dd 100644
--- a/indexing-service/src/main/java/org/apache/druid/indexing/common/task/KillUnusedSegmentsTask.java
+++ b/indexing-service/src/main/java/org/apache/druid/indexing/common/task/KillUnusedSegmentsTask.java
@@ -20,6 +20,7 @@
 package org.apache.druid.indexing.common.task;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import org.apache.druid.client.indexing.ClientKillUnusedSegmentsTaskQuery;
 import org.apache.druid.indexer.TaskStatus;
@@ -75,6 +76,7 @@ public class KillUnusedSegmentsTask extends AbstractFixedIntervalTask
   }
 
   @JsonProperty
+  @JsonInclude(JsonInclude.Include.NON_DEFAULT)
   public boolean isMarkAsUnused()
   {
     return markAsUnused;