diff --git a/include/snipplib/utils/snplib_string.h b/include/snipplib/utils/snplib_string.h
index 552034c..8140a41 100644
--- a/include/snipplib/utils/snplib_string.h
+++ b/include/snipplib/utils/snplib_string.h
@@ -11,7 +11,7 @@ namespace snplib
 
 constexpr static bool snplib_is_space(char in) noexcept
 {
-    static constexpr auto ws = {' ', '\t', '\n', '\v', '\r', '\f'};
+    static constexpr std::array ws = {' ', '\t', '\n', '\v', '\r', '\f'};
     return std::ranges::any_of(ws, [in](auto p) { return p == in; });
 };