diff --git a/zipline/finance/commission.py b/zipline/finance/commission.py
index 0e2a3838..a227ef45 100644
--- a/zipline/finance/commission.py
+++ b/zipline/finance/commission.py
@@ -78,8 +78,8 @@ class PerShare(CommissionModel):
         self.min_trade_cost = min_trade_cost
 
     def __repr__(self):
-        return "{class_name}(cost_per_share={cost}, " \
-               "min trade cost={min_trade_cost})" \
+        return "{class_name}(cost_per_share={cost_per_share}, " \
+               "min_trade_cost={min_trade_cost})" \
             .format(class_name=self.__class__.__name__,
                     cost_per_share=self.cost_per_share,
                     min_trade_cost=self.min_trade_cost)