diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockInfoStriped.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockInfoStriped.java
index 4b8d092935a00..e9c5324e799f7 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockInfoStriped.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockInfoStriped.java
@@ -105,7 +105,8 @@ private void initIndices() {
 
   private int findSlot() {
     int i = getTotalBlockNum();
-    for (; i < getCapacity(); i++) {
+    int capacity = getCapacity();
+    for (; i < capacity; i++) {
       if (getStorageInfo(i) == null) {
         return i;
       }