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-rw-r--r--tests/codegen/union-abi.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/codegen/union-abi.rs b/tests/codegen/union-abi.rs
index 2f14682dfa5..92d40d8ac14 100644
--- a/tests/codegen/union-abi.rs
+++ b/tests/codegen/union-abi.rs
@@ -1,5 +1,5 @@
 //@ ignore-emscripten vectors passed directly
-//@ compile-flags: -O -C no-prepopulate-passes
+//@ compile-flags: -Copt-level=3 -C no-prepopulate-passes
 // 32-bit x86 returns `f32` differently to avoid the x87 stack.
 // 32-bit systems will return 128bit values using a return area pointer.
 //@ revisions: x86 bit32 bit64