diff --git a/src/constexpr_utils.hh b/src/constexpr_utils.hh
index d9ba2abb..f83faacb 100644
--- a/src/constexpr_utils.hh
+++ b/src/constexpr_utils.hh
@@ -28,6 +28,9 @@ struct Array
     T m_data[N];
 };
 
+template<typename T, typename... U> requires (std::is_same_v<T, U> and ...)
+Array(T, U...) -> Array<T, 1 + sizeof...(U)>;
+
 template<typename T, size_t N, size_t... Indices>
 constexpr Array<T, N> make_array(const T (&data)[N], std::index_sequence<Indices...>)
 {
diff --git a/src/ranges.cc b/src/ranges.cc
index 4fe2a418..b8fb6703 100644
--- a/src/ranges.cc
+++ b/src/ranges.cc
@@ -27,7 +27,7 @@ UnitTest test_ranges{[] {
     check_equal(R"(\\,\\,)"_sv | split<StringView>(',', '\\')
                                | transform(unescape<',', '\\'>), Strs{R"(\)", R"(\)", ""});
 
-    check_equal(Array{{""_sv, "abc"_sv, ""_sv, "def"_sv, ""_sv}} | flatten(), "abcdef"_sv);
+    check_equal(Array{""_sv, "abc"_sv, ""_sv, "def"_sv, ""_sv} | flatten(), "abcdef"_sv);
     check_equal(Vector<StringView>{"", ""} | flatten(), ""_sv);
     check_equal(Vector<StringView>{} | flatten(), ""_sv);
 }};