diff --git a/include/mimalloc.h b/include/mimalloc.h
index 0b4b182c..d002ab79 100644
--- a/include/mimalloc.h
+++ b/include/mimalloc.h
@@ -303,7 +303,7 @@ mi_decl_export bool   mi_abandoned_visit_blocks(mi_subproc_id_t subproc_id, int
 // Experimental: create a new heap with a specified heap tag. Set `allow_destroy` to false to allow the thread
 // to reclaim abandoned memory (with a compatible heap_tag and arena_id) but in that case `mi_heap_destroy` will
 // fall back to `mi_heap_delete`.
-mi_decl_export mi_decl_nodiscard mi_heap_t* mi_heap_new_ex(int heap_tag, bool allow_destroy, mi_arena_id_t arena_id);
+mi_decl_nodiscard mi_decl_export mi_heap_t* mi_heap_new_ex(int heap_tag, bool allow_destroy, mi_arena_id_t arena_id);
 
 // deprecated
 mi_decl_export int    mi_reserve_huge_os_pages(size_t pages, double max_secs, size_t* pages_reserved) mi_attr_noexcept;