diff --git a/webrender/src/border.rs b/webrender/src/border.rs
index ac833628ff..c07d1a27ad 100644
--- a/webrender/src/border.rs
+++ b/webrender/src/border.rs
@@ -44,17 +44,6 @@ pub struct BorderRadiusAu {
     pub bottom_right: LayoutSizeAu,
 }
 
-impl BorderRadiusAu {
-    pub fn zero() -> Self {
-        BorderRadiusAu {
-            top_left: LayoutSizeAu::zero(),
-            top_right: LayoutSizeAu::zero(),
-            bottom_left: LayoutSizeAu::zero(),
-            bottom_right: LayoutSizeAu::zero(),
-        }
-    }
-}
-
 impl From<BorderRadius> for BorderRadiusAu {
     fn from(radius: BorderRadius) -> BorderRadiusAu {
         BorderRadiusAu {
diff --git a/webrender/src/prim_store/mod.rs b/webrender/src/prim_store/mod.rs
index b27e790753..1186752c49 100644
--- a/webrender/src/prim_store/mod.rs
+++ b/webrender/src/prim_store/mod.rs
@@ -491,15 +491,6 @@ impl<U> From<TypedSize2D<f32, U>> for SizeKey {
     }
 }
 
-impl SizeKey {
-    pub fn zero() -> SizeKey {
-        SizeKey {
-            w: 0.0,
-            h: 0.0,
-        }
-    }
-}
-
 /// A hashable vec for using as a key during primitive interning.
 #[cfg_attr(feature = "capture", derive(Serialize))]
 #[cfg_attr(feature = "replay", derive(Deserialize))]