diff --git a/adapters/pubmatic/pubmatic.go b/adapters/pubmatic/pubmatic.go
index 8eb228a71f3..bb72a207ec1 100644
--- a/adapters/pubmatic/pubmatic.go
+++ b/adapters/pubmatic/pubmatic.go
@@ -13,6 +13,7 @@ import (
 	"github.com/golang/glog"
 	"github.com/mxmCherry/openrtb"
 	"github.com/prebid/prebid-server/adapters"
+	"github.com/prebid/prebid-server/openrtb_ext"
 	"github.com/prebid/prebid-server/pbs"
 	"golang.org/x/net/context/ctxhttp"
 )
@@ -227,6 +228,9 @@ func (a *PubmaticAdapter) Call(ctx context.Context, req *pbs.PBSRequest, bidder
 				DealId:      bid.DealID,
 			}
 
+			mediaType := getMediaTypeForImp(bid.ImpID, pbReq.Imp)
+			pbid.CreativeMediaType = string(mediaType)
+
 			bids = append(bids, &pbid)
 			logf("[PUBMATIC] Returned Bid for PubID [%s] AdUnit [%s] BidID [%s] Size [%dx%d] Price [%f] \n",
 				pubId, pbid.AdUnitCode, pbid.BidID, pbid.Width, pbid.Height, pbid.Price)
@@ -236,6 +240,24 @@ func (a *PubmaticAdapter) Call(ctx context.Context, req *pbs.PBSRequest, bidder
 	return bids, nil
 }
 
+// getMediaTypeForImp figures out which media type this bid is for.
+func getMediaTypeForImp(impId string, imps []openrtb.Imp) openrtb_ext.BidType {
+	mediaType := openrtb_ext.BidTypeBanner
+	for _, imp := range imps {
+		if imp.ID == impId {
+			if imp.Video != nil {
+				mediaType = openrtb_ext.BidTypeVideo
+			} else if imp.Audio != nil {
+				mediaType = openrtb_ext.BidTypeAudio
+			} else if imp.Native != nil {
+				mediaType = openrtb_ext.BidTypeNative
+			}
+			return mediaType
+		}
+	}
+	return mediaType
+}
+
 func logf(msg string, args ...interface{}) {
 	if glog.V(2) {
 		glog.Infof(msg, args)