diff --git a/benchmark/app_pentomino.yml b/benchmark/app_pentomino.yml
index cda6785a64..ab6e19bf1a 100644
--- a/benchmark/app_pentomino.yml
+++ b/benchmark/app_pentomino.yml
@@ -1,4 +1,3 @@
-prelude: |
 benchmark:
   app_pentomino: |
     # This program is contributed by Shin Nishiyama