diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index fe1cbfd..d976b00 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -26,8 +26,8 @@
 extern const struct file_operations sysfs_dir_operations;
 extern const struct file_operations sysfs_file_operations;
 extern const struct file_operations bin_fops;
-extern struct inode_operations sysfs_dir_inode_operations;
-extern struct inode_operations sysfs_symlink_inode_operations;
+extern const struct inode_operations sysfs_dir_inode_operations;
+extern const struct inode_operations sysfs_symlink_inode_operations;
 
 struct sysfs_symlink {
 	char * link_name;