diff --git a/src/test/ui/consts/const-eval/ub-ref.rs b/src/test/ui/consts/const-eval/ub-ref.rs
index c1e2b095ad1..0d8f30159b3 100644
--- a/src/test/ui/consts/const-eval/ub-ref.rs
+++ b/src/test/ui/consts/const-eval/ub-ref.rs
@@ -1,3 +1,4 @@
+// ignore-tidy-linelength
 #![feature(const_transmute)]
 #![allow(const_err)] // make sure we cannot allow away the errors tested here