diff --git a/ostd/type_traits.hh b/ostd/type_traits.hh
index 9cb8708..fce8731 100644
--- a/ostd/type_traits.hh
+++ b/ostd/type_traits.hh
@@ -24,8 +24,6 @@ namespace detail {
     template<typename ...> struct CommonTypeBase;
 }
 
-template<typename> struct IsTriviallyDefaultConstructible;
-
 template<typename T>
 using RemoveCv = typename detail::RemoveCvBase<T>::Type;