diff --git a/components/style/properties/helpers/animated_properties.mako.rs b/components/style/properties/helpers/animated_properties.mako.rs
index f0c65e018d7..02a60d209b1 100644
--- a/components/style/properties/helpers/animated_properties.mako.rs
+++ b/components/style/properties/helpers/animated_properties.mako.rs
@@ -2459,24 +2459,6 @@ impl ToAnimatedZero for TransformList {
     }
 }
 
-impl<A, B> ToAnimatedZero for Either<A, B>
-where
-    A: ToAnimatedZero,
-    B: ToAnimatedZero,
-{
-    #[inline]
-    fn to_animated_zero(&self) -> Result<Self, ()> {
-        match *self {
-            Either::First(ref first) => {
-                Ok(Either::First(first.to_animated_zero()?))
-            },
-            Either::Second(ref second) => {
-                Ok(Either::Second(second.to_animated_zero()?))
-            },
-        }
-    }
-}
-
 /// Animated SVGPaint
 pub type IntermediateSVGPaint = SVGPaint<AnimatedRGBA, ComputedUrl>;
 
diff --git a/components/style/values/mod.rs b/components/style/values/mod.rs
index 46a520400a0..6c54e434808 100644
--- a/components/style/values/mod.rs
+++ b/components/style/values/mod.rs
@@ -69,7 +69,7 @@ impl Parse for Impossible {
 /// A struct representing one of two kinds of values.
 #[cfg_attr(feature = "servo", derive(HeapSizeOf))]
 #[derive(Animate, Clone, ComputeSquaredDistance, Copy, HasViewportPercentage)]
-#[derive(PartialEq, ToAnimatedValue, ToComputedValue, ToCss)]
+#[derive(PartialEq, ToAnimatedValue, ToAnimatedZero, ToComputedValue, ToCss)]
 pub enum Either<A, B> {
     /// The first value.
     First(A),