diff --git a/include/magic_enum.hpp b/include/magic_enum.hpp
index 5da2314..04e633a 100644
--- a/include/magic_enum.hpp
+++ b/include/magic_enum.hpp
@@ -402,19 +402,22 @@ constexpr E value(std::size_t i) noexcept {
   }
 }
 
+template <std::size_t N>
+constexpr std::size_t count_true(std::array<bool, N> valid_) noexcept {
+  auto count_ = std::size_t{0};
+  for (std::size_t i_ = 0; i_ < valid_.size(); ++i_) {
+    if (valid_[i_]) {
+      ++count_;
+    }
+  }
+  return count_;
+}
+
 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 = [](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);
+  constexpr std::size_t count = count_true(valid);
 
   std::array<E, count> values{};
   for (std::size_t i = 0, v = 0; v < count; ++i) {