diff --git a/tests/mir-opt/pre-codegen/slice_index.rs b/tests/mir-opt/pre-codegen/slice_index.rs
index 04bbbff57b3..88b99777dd9 100644
--- a/tests/mir-opt/pre-codegen/slice_index.rs
+++ b/tests/mir-opt/pre-codegen/slice_index.rs
@@ -1,5 +1,5 @@
 // skip-filecheck
-//@ compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2
+//@ compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2 -Z ub-checks=yes
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 
 #![crate_type = "lib"]