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-rw-r--r--include/zix/btree.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/zix/btree.h b/include/zix/btree.h
index 82b017a..9a661d6 100644
--- a/include/zix/btree.h
+++ b/include/zix/btree.h
@@ -88,7 +88,7 @@ zix_btree_new(const ZixAllocator* ZIX_NULLABLE allocator,
*/
ZIX_API
void
-zix_btree_free(ZixBTree* ZIX_NONNULL t,
+zix_btree_free(ZixBTree* ZIX_NULLABLE t,
ZixDestroyFunc ZIX_NULLABLE destroy,
const void* ZIX_NULLABLE destroy_user_data);