diff --git a/adapters/sovrn/sovrn.go b/adapters/sovrn/sovrn.go
index 70323b834b2..5c98f19a176 100644
--- a/adapters/sovrn/sovrn.go
+++ b/adapters/sovrn/sovrn.go
@@ -39,11 +39,11 @@ func (s *SovrnAdapter) MakeRequests(request *openrtb2.BidRequest, reqInfo *adapt
 		}
 	}
 
-	errs := make([]error, 0, 1)
+	errs := make([]error, 0, len(request.Imp))
 	var err error
-	var validImps int = 0
+	validImps := make([]openrtb2.Imp, 0, len(request.Imp))
 
-	for index, imp := range request.Imp {
+	for _, imp := range request.Imp {
 		var bidderExt adapters.ExtImpBidder
 		if err := json.Unmarshal(imp.Ext, &bidderExt); err != nil {
 			errs = append(errs, &errortypes.BadInput{
@@ -60,7 +60,7 @@ func (s *SovrnAdapter) MakeRequests(request *openrtb2.BidRequest, reqInfo *adapt
 			continue
 		}
 
-		tagId := getTagid(sovrnExt)
+		tagId := getTagId(sovrnExt)
 		if tagId == "" {
 			errs = append(errs, &errortypes.BadInput{
 				Message: "Missing required parameter 'tagid'",
@@ -68,7 +68,7 @@ func (s *SovrnAdapter) MakeRequests(request *openrtb2.BidRequest, reqInfo *adapt
 			continue
 		}
 
-		imp.TagID = getTagid(sovrnExt)
+		imp.TagID = tagId
 
 		if imp.BidFloor == 0 && sovrnExt.BidFloor > 0 {
 			imp.BidFloor = sovrnExt.BidFloor
@@ -88,14 +88,15 @@ func (s *SovrnAdapter) MakeRequests(request *openrtb2.BidRequest, reqInfo *adapt
 			}
 		}
 
-		validImps++
-		request.Imp[index] = imp
+		validImps = append(validImps, imp)
 	}
 
-	if validImps == 0 {
+	if len(validImps) == 0 {
 		return nil, errs
 	}
 
+	request.Imp = validImps
+
 	reqJSON, err := json.Marshal(request)
 	if err != nil {
 		errs = append(errs, err)
@@ -116,31 +117,32 @@ func addHeaderIfNonEmpty(headers http.Header, headerName string, headerValue str
 	}
 }
 
-func (s *SovrnAdapter) MakeBids(request *openrtb2.BidRequest, requestData *adapters.RequestData, responseData *adapters.ResponseData) (*adapters.BidderResponse, []error) {
-	if responseData.StatusCode == http.StatusNoContent {
+func (s *SovrnAdapter) MakeBids(request *openrtb2.BidRequest, bidderRequest *adapters.RequestData, bidderResponse *adapters.ResponseData) (*adapters.BidderResponse, []error) {
+	if bidderResponse.StatusCode == http.StatusNoContent {
 		return nil, nil
 	}
 
-	if responseData.StatusCode == http.StatusBadRequest {
+	if bidderResponse.StatusCode == http.StatusBadRequest {
 		return nil, []error{&errortypes.BadInput{
-			Message: fmt.Sprintf("Unexpected status code: %d. Run with request.debug = 1 for more info", responseData.StatusCode),
+			Message: fmt.Sprintf("Unexpected status code: %d. Run with request.debug = 1 for more info", bidderResponse.StatusCode),
 		}}
 	}
 
-	if responseData.StatusCode != http.StatusOK {
+	if bidderResponse.StatusCode != http.StatusOK {
 		return nil, []error{&errortypes.BadServerResponse{
-			Message: fmt.Sprintf("Unexpected status code: %d. Run with request.debug = 1 for more info", responseData.StatusCode),
+			Message: fmt.Sprintf("Unexpected status code: %d. Run with request.debug = 1 for more info", bidderResponse.StatusCode),
 		}}
 	}
 
 	var bidResponse openrtb2.BidResponse
-	if err := json.Unmarshal(responseData.Body, &bidResponse); err != nil {
+	if err := json.Unmarshal(bidderResponse.Body, &bidResponse); err != nil {
 		return nil, []error{&errortypes.BadServerResponse{
 			Message: err.Error(),
 		}}
 	}
 
 	response := adapters.NewBidderResponseWithBidsCapacity(5)
+	errs := make([]error, 0)
 
 	for _, sb := range bidResponse.SeatBid {
 		for _, bid := range sb.Bid {
@@ -150,8 +152,11 @@ func (s *SovrnAdapter) MakeBids(request *openrtb2.BidRequest, requestData *adapt
 
 				bidType := openrtb_ext.BidTypeBanner
 
-				impIdx := getImpIdx(bid.ImpID, request)
-				if impIdx != -1 && request.Imp[impIdx].Video != nil {
+				impIdx, impIdErr := getImpIdx(bid.ImpID, request)
+				if impIdErr != nil {
+					errs = append(errs, impIdErr)
+					continue
+				} else if request.Imp[impIdx].Video != nil {
 					bidType = openrtb_ext.BidTypeVideo
 				}
 
@@ -163,10 +168,10 @@ func (s *SovrnAdapter) MakeBids(request *openrtb2.BidRequest, requestData *adapt
 		}
 	}
 
-	return response, nil
+	return response, errs
 }
 
-func getTagid(sovrnExt openrtb_ext.ExtImpSovrn) string {
+func getTagId(sovrnExt openrtb_ext.ExtImpSovrn) string {
 	if len(sovrnExt.Tagid) > 0 {
 		return sovrnExt.Tagid
 	} else {
@@ -174,14 +179,16 @@ func getTagid(sovrnExt openrtb_ext.ExtImpSovrn) string {
 	}
 }
 
-func getImpIdx(impId string, request *openrtb2.BidRequest) int {
+func getImpIdx(impId string, request *openrtb2.BidRequest) (int, error) {
 	for idx, imp := range request.Imp {
 		if imp.ID == impId {
-			return idx
+			return idx, nil
 		}
 	}
 
-	return -1 // hopefully this never happens
+	return -1, &errortypes.BadInput{
+		Message: fmt.Sprintf("Could not find imp ID '%s' in bid, dropping bid", impId),
+	}
 }
 
 // Builder builds a new instance of the Sovrn adapter for the given bidder with the given config.