diff --git a/src/servo-gfx/geometry.rs b/src/servo-gfx/geometry.rs
index f1803a7bbb4..e5835bf008b 100644
--- a/src/servo-gfx/geometry.rs
+++ b/src/servo-gfx/geometry.rs
@@ -22,12 +22,12 @@ impl Mul<Au,Au> for Au {
     fn mul(&self, other: &Au) -> Au { Au(**self * **other) }
 }
 
-impl Div<Au,Au> for Au {
-    fn div(&self, other: &Au) -> Au { Au(**self / **other) }
+impl Quot<Au,Au> for Au {
+    fn quot(&self, other: &Au) -> Au { Au(**self / **other) }
 }
 
-impl Modulo<Au,Au> for Au {
-    fn modulo(&self, other: &Au) -> Au { Au(**self % **other) }
+impl Rem<Au,Au> for Au {
+    fn rem(&self, other: &Au) -> Au { Au(**self % **other) }
 }
 
 impl Neg<Au> for Au {