diff --git a/lib/oven.py b/lib/oven.py
index d7938f8..e38be34 100644
--- a/lib/oven.py
+++ b/lib/oven.py
@@ -389,11 +389,10 @@ class RealOven(Oven):
         super().reset()
         self.output.cool(0)
 
-    def heat_then_cool(self, catching_up):
+    def heat_then_cool(self):
         pid = self.pid.compute(self.target,
                                self.board.temp_sensor.temperature +
-                               config.thermocouple_offset,
-                               catching_up)
+                               config.thermocouple_offset)
         heat_on = float(self.time_step * pid)
         heat_off = float(self.time_step * (1 - pid))