diff --git a/source/mijin/memory/memutil.hpp b/source/mijin/memory/memutil.hpp
index 3291194..bb4598e 100644
--- a/source/mijin/memory/memutil.hpp
+++ b/source/mijin/memory/memutil.hpp
@@ -20,7 +20,8 @@ private:
     [[no_unique_address]] TAllocator allocator_;
 
 public:
-    explicit AllocatorDeleter(TAllocator allocator = {}) MIJIN_NOEXCEPT_IF(std::is_nothrow_move_constructible_v<TAllocator>)
+    AllocatorDeleter() = default;
+    explicit AllocatorDeleter(TAllocator allocator) MIJIN_NOEXCEPT_IF(std::is_nothrow_move_constructible_v<TAllocator>)
         : allocator_(std::move(allocator)) {}
 
     template<typename TOtherAllocator> requires (std::is_constructible_v<TAllocator, const TOtherAllocator&>)
@@ -69,6 +70,10 @@ class AllocatorDeleter<std::allocator<T>>
 {
 public:
     AllocatorDeleter() noexcept = default;
+
+    template<typename TOther>
+    AllocatorDeleter(std::allocator<TOther>) noexcept {}
+
     template<typename TOther>
     AllocatorDeleter(const AllocatorDeleter<std::allocator<TOther>>&) noexcept {}