--- a/gfx/webrender_bindings/src/bindings.rs
+++ b/gfx/webrender_bindings/src/bindings.rs
@@ -1864,17 +1864,17 @@ pub extern "C" fn wr_dp_push_iframe(stat
                                     rect: LayoutRect,
                                     is_backface_visible: bool,
                                     pipeline_id: WrPipelineId) {
     debug_assert!(unsafe { is_in_main_thread() });
 
     let mut prim_info = LayoutPrimitiveInfo::new(rect);
     prim_info.is_backface_visible = is_backface_visible;
     prim_info.tag = state.current_tag;
-    state.frame_builder.dl_builder.push_iframe(&prim_info, pipeline_id);
+    state.frame_builder.dl_builder.push_iframe(&prim_info, pipeline_id, true);
 }
 
 #[no_mangle]
 pub extern "C" fn wr_dp_push_rect(state: &mut WrState,
                                   rect: LayoutRect,
                                   clip: LayoutRect,
                                   is_backface_visible: bool,
                                   color: ColorF) {