diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index fd560bb542a..ae3b1ed72be 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -1923,7 +1923,7 @@ impl IDLInterface for ${type} {
     fn get_prototype_id() -> PrototypeList::ID {
         PrototypeList::ID::${type}
     }
-    fn get_prototype_depth() -> uint {
+    fn get_prototype_depth() -> usize {
         ${depth}
     }
 }
diff --git a/components/script/dom/bindings/conversions.rs b/components/script/dom/bindings/conversions.rs
index da44795748c..4d5c0ee668a 100644
--- a/components/script/dom/bindings/conversions.rs
+++ b/components/script/dom/bindings/conversions.rs
@@ -62,7 +62,7 @@ pub trait IDLInterface {
     fn get_prototype_id() -> PrototypeList::ID;
     /// Returns the prototype depth, i.e., the number of interfaces this
     /// interface inherits from.
-    fn get_prototype_depth() -> uint;
+    fn get_prototype_depth() -> usize;
 }
 
 /// A trait to convert Rust types to `JSVal`s.