diff --git a/benchmarks/step_detect.py b/benchmarks/step_detect.py
index 1bc017612..cdaeba218 100644
--- a/benchmarks/step_detect.py
+++ b/benchmarks/step_detect.py
@@ -17,4 +17,4 @@ def time_detect_regressions(self):
             step_detect.detect_regressions(self.y)
 
     def time_solve_potts_approx(self):
-        step_detect.solve_potts_approx(self.y, 0.3, p=1)
+        step_detect.solve_potts_approx(self.y, [1] * len(self.y), gamma=0.3)