diff --git a/common/http_fetcher.h b/common/http_fetcher.h
index 7fa5f09..80985af 100644
--- a/common/http_fetcher.h
+++ b/common/http_fetcher.h
@@ -170,7 +170,7 @@
   ErrorCode auxiliary_error_code_{ErrorCode::kSuccess};
 
   // The delegate; may be null.
-  HttpFetcherDelegate* delegate_;
+  HttpFetcherDelegate* delegate_ = nullptr;
 
   // Proxy servers
   std::deque<std::string> proxies_;