diff --git a/r2/r2/controllers/promotecontroller.py b/r2/r2/controllers/promotecontroller.py
index 7f85b4524..33b8a6ef2 100644
--- a/r2/r2/controllers/promotecontroller.py
+++ b/r2/r2/controllers/promotecontroller.py
@@ -374,7 +374,8 @@ class PromoteController(ListingController):
                                                       billable_impressions)
         refund_amount = campaign.bid - billable_amount
         if refund_amount > 0:
-            promote.refund_campaign(link, campaign, billable_amount)
+            promote.refund_campaign(link, campaign, billable_amount,
+                                    billable_impressions)
             form.set_html('.status', _('refund succeeded'))
         else:
             form.set_html('.status', _('refund not needed'))
diff --git a/r2/r2/lib/promote.py b/r2/r2/lib/promote.py
index 6404cc587..76e376325 100644
--- a/r2/r2/lib/promote.py
+++ b/r2/r2/lib/promote.py
@@ -838,7 +838,7 @@ def finalize_completed_campaigns(daysago=1):
             set_underdelivered_campaigns(underdelivered_campaigns)
 
 
-def refund_campaign(link, camp, billable_amount):
+def refund_campaign(link, camp, billable_amount, billable_impressions):
     refund_amount = camp.bid - billable_amount
     owner = Account._byID(camp.owner_id, data=True)
     try: