diff --git a/tests/codegen/dont-shufflevector-bswaps.rs b/tests/codegen/dont-shufflevector-bswaps.rs
index c30fe89ba751..263759173fd3 100644
--- a/tests/codegen/dont-shufflevector-bswaps.rs
+++ b/tests/codegen/dont-shufflevector-bswaps.rs
@@ -1,6 +1,8 @@
 //@ revisions: OPT2 OPT3
-//@ [OPT2] compile-flags: -Copt-level=2
-//@ [OPT3] compile-flags: -C opt-level=3
+//@[OPT2] compile-flags: -Copt-level=2
+//@[OPT3] compile-flags: -Copt-level=3
+// wasm32 optimizes poorly for some reason
+//@[OPT3] ignore-wasm
 //@ min-llvm-version: 18.1.3
 
 #![crate_type = "lib"]