diff --git a/cmd/db-exporter/src/main.rs b/cmd/db-exporter/src/main.rs
index e3c34ee8f1..8a069479e6 100644
--- a/cmd/db-exporter/src/main.rs
+++ b/cmd/db-exporter/src/main.rs
@@ -2270,7 +2270,7 @@ pub fn block_output(
     let mut chain = BlockChain::new(
         net.time_service(),
         block.header.parent_hash(),
-        storage.clone(),
+        storage,
         None,
     )
     .expect("create block chain should success.");