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-rw-r--r--src/test/codegen/packed.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/test/codegen/packed.rs b/src/test/codegen/packed.rs
index c31e8457dcd..6ab28e87cb6 100644
--- a/src/test/codegen/packed.rs
+++ b/src/test/codegen/packed.rs
@@ -1,5 +1,5 @@
 // ignore-tidy-linelength
-// compile-flags: -C no-prepopulate-passes
+// compile-flags: -O -C no-prepopulate-passes
 
 #![crate_type = "lib"]