diff --git a/kernel/audit.c b/kernel/audit.c
index 7dfac70..82443fb 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -818,7 +818,7 @@
  */
 unsigned int audit_serial(void)
 {
-	static spinlock_t serial_lock = SPIN_LOCK_UNLOCKED;
+	static DEFINE_SPINLOCK(serial_lock);
 	static unsigned int serial = 0;
 
 	unsigned long flags;