diff --git a/system-helper/flatpak-system-helper.c b/system-helper/flatpak-system-helper.c
index 0f5ef97b..476d1a43 100644
--- a/system-helper/flatpak-system-helper.c
+++ b/system-helper/flatpak-system-helper.c
@@ -579,7 +579,7 @@ flatpak_authorize_method_handler (GDBusInterfaceSkeleton *interface,
     {
       const char *path;
 
-      g_variant_get_child (parameters, 0, "^ay", &path);
+      g_variant_get_child (parameters, 0, "^&ay", &path);
 
       action = "org.freedesktop.Flatpak.install-bundle";