diff --git a/src/Corporation/Actions.ts b/src/Corporation/Actions.ts
index ecbfb2eff..20abbe0b6 100644
--- a/src/Corporation/Actions.ts
+++ b/src/Corporation/Actions.ts
@@ -257,7 +257,7 @@ export function BulkPurchase(corp: ICorporation, warehouse: Warehouse, material:
   if (isNaN(amt) || amt < 0) {
     throw new Error(`Invalid input amount`);
   }
-  if (amt * matSize <= maxAmount) {
+  if (amt > maxAmount) {
     throw new Error(`You do not have enough warehouse size to fit this purchase`);
   }
   const cost = amt * material.bCost;