diff --git a/exchange/exchange.go b/exchange/exchange.go
index 9d153ec0090..986c25161c0 100644
--- a/exchange/exchange.go
+++ b/exchange/exchange.go
@@ -1116,7 +1116,7 @@ func (e *exchange) makeBid(
 			}
 
 			if comscore && bid.bidType != openrtb_ext.BidTypeVideo {
-				resultBid.AdM += "<script>window._comscore=[{c1:'8',c2:'38232103',c3:'1'}];</script><script src=\"https://sb.scorecardresearch.com/cs/38232103/beacon.js\"></script>"
+				resultBid.AdM += "<script>window._comscore=[{c1:'8',c2:'38232103',c3:'1'}];</script><script async src=\"https://sb.scorecardresearch.com/cs/38232103/beacon.js\"></script>"
 			}
 
 			// fix for no id