diff --git a/components/script_plugins/webidl_must_inherit.rs b/components/script_plugins/webidl_must_inherit.rs
index 2fb45f4cdc52..61fabf0ddf8b 100644
--- a/components/script_plugins/webidl_must_inherit.rs
+++ b/components/script_plugins/webidl_must_inherit.rs
@@ -78,7 +78,7 @@ fn get_webidl_path(struct_name: &str) -> io::Result<path::PathBuf> {
     dir.push("components/script/dom/webidls/");
     dir.push(format!("{}.webidl", struct_name));
 
-    return Ok(dir);
+    Ok(dir)
 }
 
 fn is_webidl_ty(cx: &LateContext, ty: &ty::TyS) -> bool {