diff --git a/clippy_lints/src/bool_assert_comparison.rs b/clippy_lints/src/bool_assert_comparison.rs
index ae36bb76117d..8f95e44bf853 100644
--- a/clippy_lints/src/bool_assert_comparison.rs
+++ b/clippy_lints/src/bool_assert_comparison.rs
@@ -56,7 +56,7 @@ fn is_impl_not_trait_with_bool_out<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -
         .and_then(|trait_id| {
             cx.tcx.associated_items(trait_id).find_by_ident_and_kind(
                 cx.tcx,
-                Ident::from_str("Output"),
+                Ident::with_dummy_span(sym::Output),
                 ty::AssocTag::Type,
                 trait_id,
             )