diff --git a/hbase-hbtop/src/main/java/org/apache/hadoop/hbase/hbtop/field/FieldValue.java b/hbase-hbtop/src/main/java/org/apache/hadoop/hbase/hbtop/field/FieldValue.java
index 6150df93c5cd..086dadc3e290 100644
--- a/hbase-hbtop/src/main/java/org/apache/hadoop/hbase/hbtop/field/FieldValue.java
+++ b/hbase-hbtop/src/main/java/org/apache/hadoop/hbase/hbtop/field/FieldValue.java
@@ -175,9 +175,12 @@ public String toString() {
       case INTEGER:
       case LONG:
       case FLOAT:
-      case SIZE:
         return value.toString();
 
+      case SIZE:
+        Size size = (Size) value;
+        return String.format("%.1f", size.get()) + size.getUnit().getSimpleName();
+
       case PERCENT:
         return String.format("%.2f", (Float) value) + "%";