diff --git a/hub/exports/building_energy/insel/insel_monthly_energy_balance.py b/hub/exports/building_energy/insel/insel_monthly_energy_balance.py
index dfc08bd4..af8462c0 100644
--- a/hub/exports/building_energy/insel/insel_monthly_energy_balance.py
+++ b/hub/exports/building_energy/insel/insel_monthly_energy_balance.py
@@ -182,8 +182,10 @@ class InselMonthlyEnergyBalance(Insel):
     inputs = ['4.1', '4.2']
     file = Insel._add_block(file, i_block, 'cum', inputs=inputs)
 
+    in_1 = f'{i_block}.1'
+    in_2 = f'{i_block}.2'
     i_block = 303 + len(surfaces)
-    inputs = ['300.1', '300.2']
+    inputs = [in_1, in_2]
     file = Insel._add_block(file, i_block, 'atend', inputs=inputs)
 
     i_block = 310 + len(surfaces)