diff --git a/src/aliyunoss.cpp b/src/aliyunoss.cpp
index 4a0a1bf..787104d 100644
--- a/src/aliyunoss.cpp
+++ b/src/aliyunoss.cpp
@@ -83,7 +83,7 @@ std::string module::aliyun_oss::updata(
             return_msg += ",code:"+ std::to_string(s->code);
         }
         if(s->error_code != NULL){
-            return_msg += ",error_code:"+ s->error_code;
+            return_msg += ",error_code:"+ std::string(s->error_code);
         }
         if(s->error_msg != NULL){
             return_msg += ",error_msg:"+ std::string(s->error_msg);
@@ -141,7 +141,7 @@ std::string module::aliyun_oss::upfile(const std::string& endpoint, const std::s
             return_msg += ",code:"+ std::to_string(s->code);
         }
         if(s->error_code != NULL){
-            return_msg += ",error_code:"+ s->error_code;
+            return_msg += ",error_code:"+ std::string(s->error_code);
         }
         if(s->error_msg != NULL){
             return_msg += ",error_msg:"+ std::string(s->error_msg);
@@ -192,7 +192,7 @@ std::string module::aliyun_oss::del(const std::string& endpoint, const std::stri
             return_msg += ",code:"+ std::to_string(s->code);
         }
         if(s->error_code != NULL){
-            return_msg += ",error_code:"+ s->error_code;
+            return_msg += ",error_code:"+ std::string(s->error_code);
         }
         if(s->error_msg != NULL){
             return_msg += ",error_msg:"+ std::string(s->error_msg);