--- a/ath/if_athvar.h
+++ b/ath/if_athvar.h
@@ -991,5 +991,5 @@
 #endif
 /* Protects the device from concurrent accesses */
-#define	ATH_LOCK_INIT(_sc)		init_MUTEX(&(_sc)->sc_lock)
+#define	ATH_LOCK_INIT(_sc)		sema_init(&(_sc)->sc_lock, 1)
 #define	ATH_LOCK_DESTROY(_sc)
 #define	ATH_LOCK(_sc)			down(&(_sc)->sc_lock)