diff --git a/src/test/codegen/vec-in-place.rs b/src/test/codegen/vec-in-place.rs
index 51b570e8be68..72ed7492be93 100644
--- a/src/test/codegen/vec-in-place.rs
+++ b/src/test/codegen/vec-in-place.rs
@@ -1,3 +1,4 @@
+// ignore-debug: the debug assertions get in the way
 // compile-flags: -O
 // min-llvm-version: 11.0
 #![crate_type = "lib"]