diff --git a/Src/TOSLib.hpp b/Src/TOSLib.hpp
index f2416aa..0fa7e9d 100644
--- a/Src/TOSLib.hpp
+++ b/Src/TOSLib.hpp
@@ -588,4 +588,4 @@ public:
 
 }
 
-#define MAKE_ERROR(arg) throw std::runtime_error((std::ostringstream() << arg).str())
+#define MAKE_ERROR(arg) throw std::runtime_error(static_cast<std::ostringstream&>(std::ostringstream() << arg).str())