diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index e65a019..c19ac15 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -137,6 +137,7 @@
 /* ioctl.c */
 extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
 		       unsigned long);
+extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
 
 /* namei.c */
 struct dentry *ext2_get_parent(struct dentry *child);