diff --git a/src/components/script/dom/bindings/utils.rs b/src/components/script/dom/bindings/utils.rs
index e20fdeba893a7..ffe04b39f4497 100644
--- a/src/components/script/dom/bindings/utils.rs
+++ b/src/components/script/dom/bindings/utils.rs
@@ -624,8 +624,7 @@ pub extern fn ThrowingConstructor(_cx: *JSContext, _argc: uint, _vp: *JSVal) ->
 }
 
 pub fn initialize_global(global: *JSObject) {
-    let protoArray = @mut ([0 as *JSObject, ..53]);
-    assert!(protoArray.len() == PrototypeList::id::_ID_Count as uint);
+    let protoArray = @mut ([0 as *JSObject, ..PrototypeList::id::_ID_Count as uint]);
     unsafe {
         //XXXjdm we should be storing the box pointer instead of the inner
         let box = squirrel_away(protoArray);