diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/Block.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/Block.java
index 23bfa95b4f..4128eced0a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/Block.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/Block.java
@@ -162,7 +162,9 @@ public void setGenerationStamp(long stamp) {
    */
   public static String toString(final Block b) {
     StringBuilder sb = new StringBuilder();
-    b.appendStringTo(sb);
+    sb.append(BLOCK_FILE_PREFIX).
+       append(b.blockId).append("_").
+       append(b.generationStamp);
     return sb.toString();
   }