diff --git a/toml/traits.hpp b/toml/traits.hpp
index e2036eb..408e4a4 100644
--- a/toml/traits.hpp
+++ b/toml/traits.hpp
@@ -20,10 +20,6 @@ class basic_value;
 
 namespace detail
 {
-
-template<typename T>
-using unwrap_t = typename std::decay<T>::type;
-
 // ---------------------------------------------------------------------------
 // check whether type T is a kind of container/map class