diff --git a/decoimpact/business/entities/rules/multiply_rule.py b/decoimpact/business/entities/rules/multiply_rule.py
index 70e4b79a..5ff93f55 100644
--- a/decoimpact/business/entities/rules/multiply_rule.py
+++ b/decoimpact/business/entities/rules/multiply_rule.py
@@ -69,7 +69,11 @@ def execute(self, value_array: _xr.DataArray, logger: ILogger) -> _xr.DataArray:
                 start = self._convert_datestr(self.date_range[index][0])
                 end = self._convert_datestr(self.date_range[index][1])
                 dr_date = old_dr.time.dt.strftime(r"%m-%d")
-                new_dr = _xr.where((start < dr_date) & (dr_date < end), old_dr * mp, new_dr)
+                new_dr = _xr.where(
+                    (start < dr_date) & (dr_date < end),
+                    old_dr * mp,
+                    new_dr
+                )
             else:
                 new_dr = old_dr * mp
         return new_dr