diff --git a/lib/include/tree_sitter/api.h b/lib/include/tree_sitter/api.h
index 04aed846..bd78c6e6 100644
--- a/lib/include/tree_sitter/api.h
+++ b/lib/include/tree_sitter/api.h
@@ -369,8 +369,8 @@ void ts_tree_edit(TSTree *self, const TSInputEdit *edit);
  * given `length` pointer.
  */
 TSRange *ts_tree_get_changed_ranges(
-  const TSTree *self,
   const TSTree *old_tree,
+  const TSTree *self,
   uint32_t *length
 );
 
diff --git a/lib/src/tree.c b/lib/src/tree.c
index 04cb1d24..e4148c2d 100644
--- a/lib/src/tree.c
+++ b/lib/src/tree.c
@@ -89,7 +89,7 @@ TSRange *ts_tree_get_changed_ranges(const TSTree *self, const TSTree *other, uin
   TreeCursor cursor2 = {NULL, array_new()};
   TSNode root = ts_tree_root_node(self);
   ts_tree_cursor_init(&cursor1, root);
-  ts_tree_cursor_init(&cursor2, root);
+  ts_tree_cursor_init(&cursor2, root); // really other's root, but reinitialized later
 
   TSRangeArray included_range_differences = array_new();
   ts_range_array_get_changed_ranges(