diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index 775cc49..6420198 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -135,7 +135,7 @@
 	return;
 }
 
-int do_sysctl(int __user *args_name, int nlen,
+static int do_sysctl(int __user *args_name, int nlen,
 	void __user *oldval, size_t __user *oldlenp,
 	void __user *newval, size_t newlen)
 {