diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/AbstractMemStore.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/AbstractMemStore.java
index cbd3b1632d8c..3c3834a4df8a 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/AbstractMemStore.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/AbstractMemStore.java
@@ -259,7 +259,7 @@ public String toString() {
     int i = 1;
     try {
       for (Segment segment : getSegments()) {
-        buf.append("Segment (" + i + ") " + segment.toString() + "; ");
+        buf.append("Segment (").append(i).append(") ").append(segment.toString()).append("; ");
         i++;
       }
     } catch (IOException e){