diff --git a/src/tools/rustfmt/src/expr.rs b/src/tools/rustfmt/src/expr.rs
index 8dead8f078d6f..4b86c2acdc538 100644
--- a/src/tools/rustfmt/src/expr.rs
+++ b/src/tools/rustfmt/src/expr.rs
@@ -1947,7 +1947,7 @@ fn rewrite_unary_op(
 }
 
 pub(crate) enum RhsAssignKind<'ast> {
-    Expr(&'ast ast::ExprKind, #[allow(unused_tuple_struct_fields)] Span),
+    Expr(&'ast ast::ExprKind, #[allow(dead_code)] Span),
     Bounds,
     Ty,
 }