diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestFsDatasetCache.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestFsDatasetCache.java
index cace183ca1..e3945f1708 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestFsDatasetCache.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestFsDatasetCache.java
@@ -546,7 +546,7 @@ public Boolean get() {
         MetricsAsserts.getLongCounter("BlocksCached", dnMetrics));
     
     // Uncache the big file and verify that the small file can now be
-    // cached (regression test for HDFS-XXXX)
+    // cached (regression test for HDFS-6107)
     dfs.removeCacheDirective(bigCacheDirectiveId);
     GenericTestUtils.waitFor(new Supplier<Boolean>() {
       @Override