diff --git a/indexing-service/src/main/java/org/apache/druid/indexing/common/index/RealtimeAppenderatorTuningConfig.java b/indexing-service/src/main/java/org/apache/druid/indexing/common/index/RealtimeAppenderatorTuningConfig.java
index b66ccc86f1d9..eec9b98d4973 100644
--- a/indexing-service/src/main/java/org/apache/druid/indexing/common/index/RealtimeAppenderatorTuningConfig.java
+++ b/indexing-service/src/main/java/org/apache/druid/indexing/common/index/RealtimeAppenderatorTuningConfig.java
@@ -143,6 +143,7 @@ public int getMaxRowsInMemory()
   }
 
   @Override
+  @JsonProperty
   public long getMaxBytesInMemory()
   {
     return maxBytesInMemory;
diff --git a/indexing-service/src/test/java/org/apache/druid/indexing/common/task/TaskSerdeTest.java b/indexing-service/src/test/java/org/apache/druid/indexing/common/task/TaskSerdeTest.java
index 2ba37ff0bd09..c5841eaa27b4 100644
--- a/indexing-service/src/test/java/org/apache/druid/indexing/common/task/TaskSerdeTest.java
+++ b/indexing-service/src/test/java/org/apache/druid/indexing/common/task/TaskSerdeTest.java
@@ -394,7 +394,7 @@ public void testRealtimeIndexTaskSerde() throws Exception
 
             new RealtimeTuningConfig(
                 1,
-                null,
+                10L,
                 new Period("PT10M"),
                 null,
                 null,
@@ -445,6 +445,10 @@ public void testRealtimeIndexTaskSerde() throws Exception
         task.getRealtimeIngestionSchema().getTuningConfig().getWindowPeriod(),
         task2.getRealtimeIngestionSchema().getTuningConfig().getWindowPeriod()
     );
+    Assert.assertEquals(
+        task.getRealtimeIngestionSchema().getTuningConfig().getMaxBytesInMemory(),
+        task2.getRealtimeIngestionSchema().getTuningConfig().getMaxBytesInMemory()
+    );
     Assert.assertEquals(
         task.getRealtimeIngestionSchema().getDataSchema().getGranularitySpec().getSegmentGranularity(),
         task2.getRealtimeIngestionSchema().getDataSchema().getGranularitySpec().getSegmentGranularity()
diff --git a/server/src/main/java/org/apache/druid/segment/indexing/RealtimeTuningConfig.java b/server/src/main/java/org/apache/druid/segment/indexing/RealtimeTuningConfig.java
index a4679441ce4f..728e2ffac57b 100644
--- a/server/src/main/java/org/apache/druid/segment/indexing/RealtimeTuningConfig.java
+++ b/server/src/main/java/org/apache/druid/segment/indexing/RealtimeTuningConfig.java
@@ -174,6 +174,7 @@ public int getMaxRowsInMemory()
   }
 
   @Override
+  @JsonProperty
   public long getMaxBytesInMemory()
   {
     return maxBytesInMemory;