diff --git a/include/ylt/standalone/cinatra/utils.hpp b/include/ylt/standalone/cinatra/utils.hpp
index 93d469964..44b099049 100644
--- a/include/ylt/standalone/cinatra/utils.hpp
+++ b/include/ylt/standalone/cinatra/utils.hpp
@@ -24,6 +24,7 @@
 
 #include "define.h"
 #include "response_cv.hpp"
+#include "string_resize.hpp"
 
 namespace cinatra {
 struct ci_less {