diff --git a/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java b/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
index 3b8f09527a8..1794df859a5 100644
--- a/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
+++ b/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
@@ -3072,7 +3072,7 @@ public class HRegion implements HeapSize { // , Writable{
   }
 
   public static final long FIXED_OVERHEAD = ClassSize.align(
-      (5 * Bytes.SIZEOF_LONG) + Bytes.SIZEOF_BOOLEAN +
+      (4 * Bytes.SIZEOF_LONG) + Bytes.SIZEOF_BOOLEAN +
       (21 * ClassSize.REFERENCE) + ClassSize.OBJECT + Bytes.SIZEOF_INT);
 
   public static final long DEEP_OVERHEAD = ClassSize.align(FIXED_OVERHEAD +
diff --git a/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java b/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
index e8983c16e94..04b7522b5f4 100644
--- a/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
+++ b/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
@@ -1451,9 +1451,8 @@ public class Store implements HeapSize {
   }
 
   public static final long FIXED_OVERHEAD = ClassSize.align(
-      ClassSize.OBJECT + (16 * ClassSize.REFERENCE) +
-      (6 * Bytes.SIZEOF_LONG) + (3 * Bytes.SIZEOF_INT) + Bytes.SIZEOF_BOOLEAN +
-      ClassSize.align(ClassSize.ARRAY));
+      ClassSize.OBJECT + (15 * ClassSize.REFERENCE) +
+      (4 * Bytes.SIZEOF_LONG) + (3 * Bytes.SIZEOF_INT) + (Bytes.SIZEOF_BOOLEAN * 2));
 
   public static final long DEEP_OVERHEAD = ClassSize.align(FIXED_OVERHEAD +
       ClassSize.OBJECT + ClassSize.REENTRANT_LOCK +