diff --git a/include/magic_enum.hpp b/include/magic_enum.hpp
index 4f22747..1988842 100644
--- a/include/magic_enum.hpp
+++ b/include/magic_enum.hpp
@@ -406,7 +406,15 @@ template <typename E, bool IsFlags, int Min, std::size_t... I>
 constexpr auto values(std::index_sequence<I...>) noexcept {
   static_assert(is_enum_v<E>, "magic_enum::detail::values requires enum type.");
   constexpr std::array<bool, sizeof...(I)> valid{{is_valid<E, value<E, Min, IsFlags>(I)>()...}};
-  constexpr std::size_t count = ((valid[I] ? std::size_t{1} : std::size_t{0}) + ...);
+  constexpr std::size_t count = [](decltype((valid)) valid_) constexpr noexcept -> std::size_t {
+    auto count_ = std::size_t{0};
+    for (std::size_t i_ = 0; i_ < valid_.size(); ++i_) {
+      if (valid_[i_]) {
+        ++count_;
+      }
+    }
+    return count_;
+  }(valid);
 
   std::array<E, count> values{};
   for (std::size_t i = 0, v = 0; v < count; ++i) {