diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
index 59dcf3ce0af..980db3c5f64 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
@@ -836,7 +836,7 @@ public class HRegion implements HeapSize { // , Writable{
     if (this.rsAccounting != null) {
       rsAccounting.addAndGetGlobalMemstoreSize(memStoreSize);
     }
-    return this.memstoreSize.getAndAdd(memStoreSize);
+    return this.memstoreSize.addAndGet(memStoreSize);
   }
 
   /** @return a HRegionInfo object for this region */