diff --git a/src/services/inventoryService.ts b/src/services/inventoryService.ts
index 765fe485..6357d404 100644
--- a/src/services/inventoryService.ts
+++ b/src/services/inventoryService.ts
@@ -558,7 +558,7 @@ export const addItem = async (
     }
     if (typeName in ExportEmailItems) {
         if (quantity != 1) {
-            throw new Error(`unexpected acquisition quantity of EmailItems: got ${quantity}, expected 0`);
+            throw new Error(`unexpected acquisition quantity of EmailItems: got ${quantity}, expected 1`);
         }
         return await addEmailItem(inventory, typeName);
     }