diff --git a/src/game.rs b/src/game.rs
index 40edfc3..30a95a6 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -349,8 +349,11 @@ impl Game {
 
         // a room has tiles, so handle before room
         for tile in &game.tiles {
-            let new_id = self.add_tile(tile.clone());
-            insert_if_different(tile_id_changes.borrow_mut(), tile.id.clone(), new_id);
+            insert_if_different(
+                tile_id_changes.borrow_mut(),
+                tile.id.clone(),
+                self.add_tile(tile.clone())
+            );
         }
 
         for variable in &game.variables {
@@ -386,8 +389,11 @@ impl Game {
 
         // an ending lives in a room, so handle endings before rooms
         for ending in &game.endings {
-            let new_id = self.add_ending(ending.clone());
-            insert_if_different(ending_id_changes.borrow_mut(), ending.id.clone(), new_id);
+            insert_if_different(
+                ending_id_changes.borrow_mut(),
+                ending.id.clone(),
+                self.add_ending(ending.clone())
+            );
         }
 
         // an item has a dialogue ID, so we need to handle these after dialogues