diff --git a/components/style/properties/helpers/animated_properties.mako.rs b/components/style/properties/helpers/animated_properties.mako.rs
index 5a235b45c19..e3ee36399ac 100644
--- a/components/style/properties/helpers/animated_properties.mako.rs
+++ b/components/style/properties/helpers/animated_properties.mako.rs
@@ -953,11 +953,6 @@ impl<T: Animatable + Copy> Animatable for Point2D<T> {
     }
 }
 
-impl ToAnimatedZero for BorderCornerRadius {
-    #[inline]
-    fn to_animated_zero(&self) -> Result<Self, ()> { Err(()) }
-}
-
 /// https://drafts.csswg.org/css-transitions/#animtype-length
 impl Animatable for VerticalAlign {
     #[inline]
diff --git a/components/style/values/computed/border.rs b/components/style/values/computed/border.rs
index e4073601c10..460bf6f759b 100644
--- a/components/style/values/computed/border.rs
+++ b/components/style/values/computed/border.rs
@@ -4,6 +4,7 @@
 
 //! Computed types for CSS values related to borders.
 
+use values::animated::ToAnimatedZero;
 use values::computed::{Number, NumberOrPercentage};
 use values::computed::length::LengthOrPercentage;
 use values::generics::border::BorderCornerRadius as GenericBorderCornerRadius;
@@ -34,3 +35,11 @@ impl BorderImageSideWidth {
         GenericBorderImageSideWidth::Number(1.)
     }
 }
+
+impl ToAnimatedZero for BorderCornerRadius {
+    #[inline]
+    fn to_animated_zero(&self) -> Result<Self, ()> {
+        /// FIXME(nox): Why?
+        Err(())
+    }
+}