diff --git a/src/tools/tools.hpp b/src/tools/tools.hpp
index b3ffcfa..033d31d 100644
--- a/src/tools/tools.hpp
+++ b/src/tools/tools.hpp
@@ -12,7 +12,7 @@ namespace zt {
     private:
     T _start,_end,_step;
     public:
-        // constexpr Range()=delete;
+        constexpr Range()=delete;
         constexpr Range(const T start,const T end,const T step)noexcept:_start(start),_end(end),_step(step){}
         constexpr Range(const T start,const T end)noexcept:Range(start,end,1){}
         constexpr Range(const T end)noexcept:Range(1,end,1){}