diff --git a/cruft/util/parallel/stack.hpp b/cruft/util/parallel/stack.hpp
index 591491f9..03cbb188 100644
--- a/cruft/util/parallel/stack.hpp
+++ b/cruft/util/parallel/stack.hpp
@@ -154,7 +154,10 @@ namespace cruft::parallel {
 
     private:
         using index_type = std::size_t;
-        using raw_type = std::aligned_storage_t<sizeof(ValueT), alignof(ValueT)>;
+
+        struct raw_type {
+            alignas(ValueT) std::byte data[sizeof(ValueT)];
+        };
 
         mutable cruft::thread::spinlock m_lock;
         std::atomic<index_type> m_cursor;