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 dd8e1d2cb62..0551513d4e7 100644
--- a/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
+++ b/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
@@ -4328,7 +4328,7 @@ public class HRegion implements HeapSize { // , Writable{
   public static final long FIXED_OVERHEAD = ClassSize.align(
       ClassSize.OBJECT +
       ClassSize.ARRAY +
-      29 * ClassSize.REFERENCE + Bytes.SIZEOF_INT +
+      30 * ClassSize.REFERENCE + Bytes.SIZEOF_INT +
       (4 * Bytes.SIZEOF_LONG) +
       Bytes.SIZEOF_BOOLEAN);