diff --git a/style/properties/longhands/effects.mako.rs b/style/properties/longhands/effects.mako.rs
index e79a9df22..0c62b60c1 100644
--- a/style/properties/longhands/effects.mako.rs
+++ b/style/properties/longhands/effects.mako.rs
@@ -24,7 +24,6 @@ ${helpers.predefined_type(
     "BoxShadow",
     None,
     engines="gecko servo",
-    servo_pref="layout.legacy_layout",
     vector=True,
     simple_vector_bindings=True,
     animation_value_type="AnimatedBoxShadowList",