diff --git a/fixed_string.hpp b/fixed_string.hpp
index ecabd031..62554e3b 100644
--- a/fixed_string.hpp
+++ b/fixed_string.hpp
@@ -23,6 +23,8 @@ namespace cruft {
     struct fixed_string {
         char value[N + 1] {};
 
+        static std::size_t size (void) { return N; }
+
         constexpr
         fixed_string (char const _value[N+1]) noexcept
         {