diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 0d949c5..212360e 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1245,7 +1245,8 @@ static struct ctl_table vm_table[] = {
 		.data		= &sysctl_max_map_count,
 		.maxlen		= sizeof(sysctl_max_map_count),
 		.mode		= 0644,
-		.proc_handler	= &proc_dointvec
+		.proc_handler	= &proc_dointvec_minmax,
+		.extra1		= &zero,
 	},
 #else
 	{