--- a/gfx/wr/webrender/src/prim_store/mod.rs
+++ b/gfx/wr/webrender/src/prim_store/mod.rs
@@ -4301,23 +4301,20 @@ pub fn get_line_decoration_size(
         LineOrientation::Vertical => LayoutSize::new(perpendicular, parallel),
     })
 }
 
 fn update_opacity_binding(
     opacity_bindings: &mut OpacityBindingStorage,
     opacity_binding_index: OpacityBindingIndex,
     scene_properties: &SceneProperties,
-) -> f32 {
-    if opacity_binding_index == OpacityBindingIndex::INVALID {
-        1.0
-    } else {
+) {
+    if opacity_binding_index != OpacityBindingIndex::INVALID {
         let binding = &mut opacity_bindings[opacity_binding_index];
         binding.update(scene_properties);
-        binding.current
     }
 }
 
 /// Trait for primitives that are directly internable.
 /// see SceneBuilder::add_primitive<P>
 pub trait InternablePrimitive: intern::Internable<InternData = PrimitiveSceneData> + Sized {
     /// Build a new key from self with `info`.
     fn into_key(