diff --git a/src/seismic_hazard_forecasting.py b/src/seismic_hazard_forecasting.py
index e41d787..2213c35 100644
--- a/src/seismic_hazard_forecasting.py
+++ b/src/seismic_hazard_forecasting.py
@@ -339,8 +339,8 @@ verbose: {verbose}")
         elif time_unit == 'years':
             multiplicator = 1 / 365
 
-        # Raise an exception when time_range from the user is too large
-        if time_range/multiplicator > 0.5*(time[-1] - time[0]):
+        # Raise an exception when time_win_duration from the user is too large relative to the catalog
+        if time_win_duration/multiplicator > 0.5*(time[-1] - time[0]):
             msg = "Activity rate estimation time window must be less than half the catalog length. Use a shorter time window."
             logger.error(msg)
             raise Exception(msg)