diff --git a/novel-crawl/src/main/java/com/java2nb/novel/service/impl/CrawlServiceImpl.java b/novel-crawl/src/main/java/com/java2nb/novel/service/impl/CrawlServiceImpl.java
index 690dfe5..90f884f 100644
--- a/novel-crawl/src/main/java/com/java2nb/novel/service/impl/CrawlServiceImpl.java
+++ b/novel-crawl/src/main/java/com/java2nb/novel/service/impl/CrawlServiceImpl.java
@@ -63,7 +63,7 @@ public class CrawlServiceImpl implements CrawlService {
 
     private final IdWorker idWorker = IdWorker.INSTANCE;
 
-    private CrawlHttpClient crawlHttpClient;
+    private final CrawlHttpClient crawlHttpClient;
 
 
     @Override