diff --git a/include/fmt/std.h b/include/fmt/std.h
index ff96a9525f238..60851c32e1a37 100644
--- a/include/fmt/std.h
+++ b/include/fmt/std.h
@@ -271,7 +271,7 @@ FMT_EXPORT
 template <typename T, typename E, typename Char>
 struct formatter<
     std::expected<T, E>, Char,
-    std::enable_if_t<is_formattable<T, Char> && is_formattable<E, Char>>> {
+    std::enable_if_t<is_formattable<T, Char>::value && is_formattable<E, Char>::value>> {
   template <typename ParseContext>
   FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
     return ctx.begin();