diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
index 3f6c57851a4..3f13698e1e3 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
@@ -1837,7 +1837,7 @@ public class HStore implements Store, StoreConfiguration {
   }
 
   public static final long FIXED_OVERHEAD =
-      ClassSize.align((20 * ClassSize.REFERENCE) + (6 * Bytes.SIZEOF_LONG)
+      ClassSize.align((20 * ClassSize.REFERENCE) + (4 * Bytes.SIZEOF_LONG)
               + (3 * Bytes.SIZEOF_INT) + Bytes.SIZEOF_BOOLEAN);
 
   public static final long DEEP_OVERHEAD = ClassSize.align(FIXED_OVERHEAD