diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 277dcd6..c932aa6 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -11,6 +11,8 @@
 
 #include <linux/proc_fs.h>
 
+extern int proc_sys_init(void);
+
 struct vmalloc_info {
 	unsigned long	used;
 	unsigned long	largest_chunk;