diff --git a/components/sud_forecast.py b/components/sud_forecast.py
index cd8238d..bd6bd27 100644
--- a/components/sud_forecast.py
+++ b/components/sud_forecast.py
@@ -156,8 +156,8 @@ class SudForecastEstimator:
 			# re-assigns self.step to retrigger it) - only the *first* call
 			# for a given index is its actual start.
 			step_starts.setdefault(sud.index, t[-1])
-			pot = step.get('pot', {})
-			params = sud.derive_plant_params(pot.get('grain_mass', 0), pot.get('water_mass', 0))
+			step_pot = step.get('pot', {})
+			params = sud.derive_plant_params(step_pot.get('grain_mass', 0), step_pot.get('water_mass', 0))
 			pot.set_plant_params(params)
 			tc.set_model_plant_params(params)
 			if sud.state == SudState.RAMPING and step['temperature'] is not None: