diff --git a/src/utils.cpp b/src/utils.cpp
index 7f93d27..6555ac6 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -94,12 +94,15 @@
         return data.m_value;
     }
 
+    std::string operator()(const std::string& data) const
+    {
+        return data;
+    }
+
     template <typename T>
     std::string operator()(const T& data) const
     {
-        std::stringstream stream;
-        stream << data;
-        return stream.str();
+        return std::to_string(data);
     }
 };