diff --git a/endpoints/cookie_sync_test.go b/endpoints/cookie_sync_test.go
index 401c6796237..c8777c8b1a1 100644
--- a/endpoints/cookie_sync_test.go
+++ b/endpoints/cookie_sync_test.go
@@ -1756,7 +1756,7 @@ func TestCookieSyncHandleResponse(t *testing.T) {
 		} else {
 			bidderEval = []usersync.BidderEvaluation{}
 		}
-		endpoint.handleResponse(writer, syncTypeFilter, cookie, privacyMacros, test.givenSyncersChosen, bidderEval, test.givenDebug)
+		endpoint.handleResponse(writer, syncTypeFilter, cookie, privacyMacros, test.givenSyncersChosen, bidderEval, test.givenDebug, false, 0)
 
 		if assert.Equal(t, writer.Code, http.StatusOK, test.description+":http_status") {
 			assert.Equal(t, writer.Header().Get("Content-Type"), "application/json; charset=utf-8", test.description+":http_header")
diff --git a/endpoints/openrtb2/auction.go b/endpoints/openrtb2/auction.go
index eb3f5c02ccb..7ebbfae76c3 100644
--- a/endpoints/openrtb2/auction.go
+++ b/endpoints/openrtb2/auction.go
@@ -2020,7 +2020,7 @@ func setDeviceImplicitly(httpReq *http.Request, r *openrtb_ext.RequestWrapper, i
 	setIPImplicitly(httpReq, r, ipValidtor)
 	setUAImplicitly(httpReq, r)
 	setDoNotTrackImplicitly(httpReq, r)
-
+	secCookieDeprecation(httpReq, r)
 }
 
 // setAuctionTypeImplicitly sets the auction type to 1 if it wasn't on the request,
@@ -2352,6 +2352,33 @@ func setDoNotTrackImplicitly(httpReq *http.Request, r *openrtb_ext.RequestWrappe
 	}
 }
 
+func secCookieDeprecation(httpReq *http.Request, r *openrtb_ext.RequestWrapper) {
+	secCookieDeprecation := httpReq.Header.Get("Sec-Cookie-Deprecation")
+	if secCookieDeprecation == "" {
+		return
+	}
+
+	if r.Device == nil {
+		r.Device = &openrtb2.Device{}
+	}
+
+	updated := false
+	deviceExt := map[string]interface{}{}
+	if r.Device.Ext == nil {
+		updated = true
+		deviceExt["cdep"] = secCookieDeprecation
+	} else {
+		if err := json.Unmarshal(r.Device.Ext, &deviceExt); err == nil && deviceExt["cdep"] == nil {
+			updated = true
+			deviceExt["cdep"] = secCookieDeprecation
+		}
+	}
+
+	if updated {
+		r.Device.Ext, _ = json.Marshal(deviceExt)
+	}
+}
+
 // Write(return) errors to the client, if any. Returns true if errors were found.
 func writeError(errs []error, w http.ResponseWriter, labels *metrics.Labels) bool {
 	var rc bool = false