--- a/gfx/webrender_bindings/src/bindings.rs
+++ b/gfx/webrender_bindings/src/bindings.rs
@@ -1039,16 +1039,17 @@ pub extern "C" fn wr_dp_begin(state: &mu
                                  LayoutSize::new(width as f32, height as f32));
 
     state.frame_builder
         .dl_builder
         .push_stacking_context(webrender_traits::ScrollPolicy::Scrollable,
                                bounds,
                                0,
                                None,
+                               TransformStyle::Flat,
                                None,
                                MixBlendMode::Normal,
                                Vec::new());
 }
 
 #[no_mangle]
 pub extern "C" fn wr_dp_end(state: &mut WrState) {
     assert!(unsafe { is_in_main_thread() });
@@ -1110,16 +1111,17 @@ pub extern "C" fn wr_dp_push_stacking_co
     }
 
     state.frame_builder
         .dl_builder
         .push_stacking_context(webrender_traits::ScrollPolicy::Scrollable,
                                bounds,
                                state.z_index,
                                Some(PropertyBinding::Value(*transform)),
+                               TransformStyle::Flat,
                                None,
                                mix_blend_mode,
                                filters);
 
     let clip_bounds = LayoutRect::new(LayoutPoint::new(0.0, 0.0), bounds.size);
     state.frame_builder.dl_builder.push_scroll_layer(clip_region, clip_bounds, None);
 }