diff --git a/brewman/brewman/views/services/voucher/issue.py b/brewman/brewman/views/services/voucher/issue.py
index c091f53e..cd93baf0 100644
--- a/brewman/brewman/views/services/voucher/issue.py
+++ b/brewman/brewman/views/services/voucher/issue.py
@@ -117,7 +117,7 @@ def issue_update_inventory(voucher, newInventories, batch_consumed):
                 if batch_consumed == True and new_quantity - old_quantity > quantity_remaining:
                     raise ValidationError("Maximum quantity available for {0} is {1}".format(item.product.full_name,
                         old_quantity + quantity_remaining))
-                if item.batch.name < voucher.date:
+                if item.batch.name > voucher.date:
                     raise ValidationError("Batch of {0} was purchased after the issue date".format(item.product.name))
 
                 if batch_consumed is None: