diff --git a/components/script_plugins/lib.rs b/components/script_plugins/lib.rs
index a42eb96bf23..c1dc92abb09 100644
--- a/components/script_plugins/lib.rs
+++ b/components/script_plugins/lib.rs
@@ -407,8 +407,7 @@ fn in_derive_expn(span: Span) -> bool {
         span.ctxt().outer_expn_data().kind,
         ExpnKind::Macro {
             kind: MacroKind::Derive,
-            name: _,
-            proc_macro: _,
+            ..
         }
     )
 }