diff --git a/sys_info_param.cpp b/sys_info_param.cpp
index 79bb29c..8cebb9c 100644
--- a/sys_info_param.cpp
+++ b/sys_info_param.cpp
@@ -9,8 +9,7 @@
         return std::make_tuple(false, "");
     }
 
-    auto& callback = iterator->second;
-    auto s = callback();
+    auto s = iterator->second();
     return std::make_tuple(true, s);
 }