diff --git a/recipes/007_benchmarks_advanced.py b/recipes/007_benchmarks_advanced.py
index 2eb36a5..30d4b46 100644
--- a/recipes/007_benchmarks_advanced.py
+++ b/recipes/007_benchmarks_advanced.py
@@ -82,7 +82,7 @@ def evaluate_constraints(self, params: dict[str, float]) -> tuple[float]:
         else:
             y = params["y"]
             c1 = x + y - 3
-            return [c0, c1]
+            return c0, c1
 
 
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