diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/AvailableSpaceBlockPlacementPolicyUtils.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/AvailableSpaceBlockPlacementPolicyUtils.java
index 80c10588e96aa..c389f39da2078 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/AvailableSpaceBlockPlacementPolicyUtils.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/AvailableSpaceBlockPlacementPolicyUtils.java
@@ -129,7 +129,7 @@ protected static int compareDataNode(final DatanodeDescriptor a,
     return a.getDfsUsedPercent() < b.getDfsUsedPercent() ? -1 : 1;
   }
 
-  protected static class AvailableSpaceContext {
+  protected final static class AvailableSpaceContext {
     private final int balancedPreference;
     private final int balancedSpaceToleranceLimit;
     private final int balancedSpaceTolerance;