diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestRedundancyMonitor.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestRedundancyMonitor.java
index 0667e2611b..cfe7f41b6a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestRedundancyMonitor.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestRedundancyMonitor.java
@@ -72,7 +72,7 @@ public void testChooseTargetWhenAllDataNodesStop() throws Throwable {
       NetworkTopology clusterMap = replicator.clusterMap;
       NetworkTopology spyClusterMap = spy(clusterMap);
       replicator.clusterMap = spyClusterMap;
-      doAnswer(delayer).when(spyClusterMap).getNumOfRacks();
+      doAnswer(delayer).when(spyClusterMap).getNumOfNonEmptyRacks();
 
       ExecutorService pool = Executors.newFixedThreadPool(2);