diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.java
index f4d2c6b8d49..d8a516e13ea 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.java
@@ -164,7 +164,7 @@ public class RequestHedgingProxyProvider<T> extends
       return successfulProxy;
     }
     Map<String, ProxyInfo<T>> targetProxyInfos = new HashMap<>();
-    StringBuilder combinedInfo = new StringBuilder('[');
+    StringBuilder combinedInfo = new StringBuilder("[");
     for (int i = 0; i < proxies.size(); i++) {
       ProxyInfo<T> pInfo = super.getProxy();
       incrementProxyIndex();