diff --git a/include/mimalloc.h b/include/mimalloc.h
index c752ac24..c776efeb 100644
--- a/include/mimalloc.h
+++ b/include/mimalloc.h
@@ -166,7 +166,7 @@ mi_decl_export void mi_process_info(size_t* elapsed_msecs, size_t* user_msecs, s
 // Note that `alignment` always follows `size` for consistency with unaligned
 // allocation, but unfortunately this differs from `posix_memalign` and `aligned_alloc`.
 // -------------------------------------------------------------------------------------
-#define MI_ALIGNMENT_MAX   (1024*1024UL)    // maximum supported alignment is 1MiB
+#define MI_ALIGNMENT_MAX   (16*1024*1024UL)  // maximum supported alignment is 16MiB
 
 mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_malloc_aligned(size_t size, size_t alignment) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1) mi_attr_alloc_align(2);
 mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_malloc_aligned_at(size_t size, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1);