diff --git a/biosteam/units/distillation.py b/biosteam/units/distillation.py
index 2cd2a1a4..38b09b6a 100644
--- a/biosteam/units/distillation.py
+++ b/biosteam/units/distillation.py
@@ -1095,11 +1095,11 @@ def _cost(self):
             W_R = Design['Rectifier weight'] # in lb
             H_R = Design['Rectifier height'] # in ft
             Cost['Rectifier tower'] = design.compute_empty_tower_cost(W_R)
-            Cost['Stripper platform and ladders'] = design.compute_plaform_ladder_cost(Di_R, H_R)
+            Cost['Rectifier platform and ladders'] = design.compute_plaform_ladder_cost(Di_R, H_R)
             W_S = Design['Stripper weight'] # in lb
             H_S = Design['Stripper height'] # in ft
             Cost['Stripper tower'] = design.compute_empty_tower_cost(W_S)
-            Cost['Rectifier platform and ladders'] = design.compute_plaform_ladder_cost(Di_S, H_S)
+            Cost['Stripper platform and ladders'] = design.compute_plaform_ladder_cost(Di_S, H_S)
             
             dimensions = [(H_R, Di_R), (H_S, Di_S)]
         else: