diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.java
index daf96ef5ef3..041179a176e 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.java
@@ -1120,6 +1120,7 @@ public class BucketCache implements BlockCache, HeapSize {
       bucketAllocator = allocator;
       deserialiserMap = deserMap;
       backingMap = backingMapFromFile;
+      blockNumber.set(backingMap.size());
     } finally {
       if (ois != null) {
         ois.close();