diff --git a/src/watertap_contrib/reflo/costing/watertap_reflo_costing_package.py b/src/watertap_contrib/reflo/costing/watertap_reflo_costing_package.py
index fcf6e9ba..06bb6469 100644
--- a/src/watertap_contrib/reflo/costing/watertap_reflo_costing_package.py
+++ b/src/watertap_contrib/reflo/costing/watertap_reflo_costing_package.py
@@ -761,8 +761,7 @@ def build_integrated_costs(self):
         #     == self.aggregate_flow_heat_purchased - self.aggregate_flow_heat_sold
         # )
         self.aggregate_flow_heat_constraint = pyo.Constraint(
-            expr=self.aggregate_flow_heat
-            == self.aggregate_flow_heat_purchased
+            expr=self.aggregate_flow_heat == self.aggregate_flow_heat_purchased
         )
 
     def initialize_build(self):