diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 3dbcde5d619..735dd2634e4 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -289,6 +289,9 @@ Release 2.3.0 - UNRELEASED
     HDFS-5164.  deleteSnapshot should check if OperationCategory.WRITE is
     possible before taking write lock.  (Colin Patrick McCabe)
 
+    HDFS-5170. BlockPlacementPolicyDefault uses the wrong classname when
+    alerting to enable debug logging. (Andrew Wang)
+
 Release 2.1.1-beta - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java
index af5aab420a3..fbb922351bf 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java
@@ -55,7 +55,7 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
 
   private static final String enableDebugLogging =
     "For more information, please enable DEBUG log level on "
-    + LOG.getClass().getName();
+    + BlockPlacementPolicy.class.getName();
 
   protected boolean considerLoad; 
   private boolean preferLocalNode = true;