diff --git a/users/sterni/exercises/aoc/2021/solutions.bqn b/users/sterni/exercises/aoc/2021/solutions.bqn
index 1810fc316..443dd61a0 100755
--- a/users/sterni/exercises/aoc/2021/solutions.bqn
+++ b/users/sterni/exercises/aoc/2021/solutions.bqn
@@ -237,7 +237,7 @@ day13Folds ← ParseFolds 1 ⊑ day13Input
 
 # part 2
 
-PerformAllFolds ← {(-1)⊸⊑(<𝕩) {(𝕨 _Fold)´𝕩}` 𝕨}
+PerformAllFolds ← {𝕩 {(𝕨 _Fold)´𝕩}˜´ ⌽𝕨}
 DotMatrix ← {
   ⟨width, height⟩ ← 1+⌈´𝕩
   {𝕩? '█';' '}¨ height‿width⥊≠¨⊔((⊣+(width⊸×)∘⊢)´)¨ 𝕩