diff --git a/sys/sys/callout.h b/sys/sys/callout.h
index f5c75ecc25ee..8b514409fc58 100644
--- a/sys/sys/callout.h
+++ b/sys/sys/callout.h
@@ -72,7 +72,7 @@ void	_callout_init_lock(struct callout *, struct lock_object *, int);
 	_callout_init_lock((c), ((mtx) != NULL) ? &(mtx)->lock_object :	\
 	    NULL, (flags))
 #define	callout_init_rm(c, rm, flags)					\
-	_callout_init_lock((c), ((rm != NULL) ? &(rm)->lock_object : 	\
+	_callout_init_lock((c), ((rm) != NULL) ? &(rm)->lock_object : 	\
 	    NULL, (flags))
 #define	callout_init_rw(c, rw, flags)					\
 	_callout_init_lock((c), ((rw) != NULL) ? &(rw)->lock_object :	\