diff --git a/fs/proc/root.c b/fs/proc/root.c
index 1f86bb8..ec9cb3b 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -98,7 +98,7 @@
 	put_pid_ns(ns);
 }
 
-struct file_system_type proc_fs_type = {
+static struct file_system_type proc_fs_type = {
 	.name		= "proc",
 	.get_sb		= proc_get_sb,
 	.kill_sb	= proc_kill_sb,