--- a/gfx/webrender_bindings/src/bindings.rs
+++ b/gfx/webrender_bindings/src/bindings.rs
@@ -1357,17 +1357,17 @@ pub extern "C" fn wr_dp_pop_clip_and_scr
 }
 
 #[no_mangle]
 pub extern "C" fn wr_dp_push_iframe(state: &mut WrState,
                                     rect: WrRect,
                                     pipeline_id: WrPipelineId) {
     assert!(unsafe { is_in_main_thread() });
 
-    state.frame_builder.dl_builder.push_iframe(rect.into(), pipeline_id);
+    state.frame_builder.dl_builder.push_iframe(rect.into(), None, pipeline_id);
 }
 
 #[no_mangle]
 pub extern "C" fn wr_dp_push_rect(state: &mut WrState,
                                   rect: WrRect,
                                   clip: WrRect,
                                   color: WrColor) {
     assert!(unsafe { !is_in_render_thread() });