diff --git a/polygerrit-ui/server.go b/polygerrit-ui/server.go
index cb6d236604..33f33b793f 100644
--- a/polygerrit-ui/server.go
+++ b/polygerrit-ui/server.go
@@ -32,6 +32,7 @@ var (
 	restHost = flag.String("host", "gerrit-review.googlesource.com", "Host to proxy requests to")
 	port     = flag.String("port", ":8081", "Port to serve HTTP requests on")
 	prod     = flag.Bool("prod", false, "Serve production assets")
+	scheme   = flag.String("scheme", "https", "URL scheme")
 )
 
 func main() {
@@ -57,7 +58,7 @@ func handleRESTProxy(w http.ResponseWriter, r *http.Request) {
 	req := &http.Request{
 		Method: "GET",
 		URL: &url.URL{
-			Scheme:   "https",
+			Scheme:   *scheme,
 			Host:     *restHost,
 			Opaque:   r.URL.EscapedPath(),
 			RawQuery: r.URL.RawQuery,