diff --git a/tests/stack_unwinding_test_impl.c b/tests/stack_unwinding_test_impl.c
index b0099f0..7518a2c 100644
--- a/tests/stack_unwinding_test_impl.c
+++ b/tests/stack_unwinding_test_impl.c
@@ -48,7 +48,7 @@
 }
 
 static void noinline foo() {
-  char c1 __attribute__((cleanup(foo_cleanup)));
+  char c1 __attribute__((cleanup(foo_cleanup))) unused;
   do_crash();
 }