diff --git a/kernel/sys.c b/kernel/sys.c
index 585d6cd..20ccfb5 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -189,10 +189,10 @@
 				 !(user = find_user(who)))
 				goto out_unlock;	/* No processes for this user */
 
-			do_each_thread(g, p)
+			do_each_thread(g, p) {
 				if (__task_cred(p)->uid == who)
 					error = set_one_prio(p, niceval, error);
-			while_each_thread(g, p);
+			} while_each_thread(g, p);
 			if (who != cred->uid)
 				free_uid(user);		/* For find_user() */
 			break;
@@ -252,13 +252,13 @@
 				 !(user = find_user(who)))
 				goto out_unlock;	/* No processes for this user */
 
-			do_each_thread(g, p)
+			do_each_thread(g, p) {
 				if (__task_cred(p)->uid == who) {
 					niceval = 20 - task_nice(p);
 					if (niceval > retval)
 						retval = niceval;
 				}
-			while_each_thread(g, p);
+			} while_each_thread(g, p);
 			if (who != cred->uid)
 				free_uid(user);		/* for find_user() */
 			break;