diff --git a/2019/day13/part1.rb b/2019/day13/part1.rb
index f983a2c..df32f00 100644
--- a/2019/day13/part1.rb
+++ b/2019/day13/part1.rb
@@ -90,7 +90,7 @@ class Game
       blocks = @screen.tiles.values.count { |val| val == :block }
       puts blocks
     rescue DoneExecuting
-      nil
+      return nil
     end
   end