diff --git a/regressions/ck_stack/validate/serial.c b/regressions/ck_stack/validate/serial.c
index 50f6c95..c4bea18 100644
--- a/regressions/ck_stack/validate/serial.c
+++ b/regressions/ck_stack/validate/serial.c
@@ -77,7 +77,7 @@ serial(ck_stack_t *stack)
 int
 main(void)
 {
-	ck_stack_t stack;
+	ck_stack_t stack CK_CC_CACHELINE;
 
 	serial(&stack);
 	return (0);