diff --git a/src/tools/tools.hpp b/src/tools/tools.hpp
index ea24f30..464c92e 100644
--- a/src/tools/tools.hpp
+++ b/src/tools/tools.hpp
@@ -45,7 +45,7 @@ namespace zt {
 
     template<typename ...Args>
     inline void raw_print(std::ostream &os,const Args&...args){
-        std::stringstream ss;
+        std::ostringstream ss;
         ((ss<<args),...);
         os<<ss.str();
         return;