diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index e016ee9..73ef84f 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -75,8 +75,8 @@
 extern ino_t minix_inode_by_name(struct dentry*);
 extern int minix_sync_file(struct file *, struct dentry *, int);
 
-extern struct inode_operations minix_file_inode_operations;
-extern struct inode_operations minix_dir_inode_operations;
+extern const struct inode_operations minix_file_inode_operations;
+extern const struct inode_operations minix_dir_inode_operations;
 extern const struct file_operations minix_file_operations;
 extern const struct file_operations minix_dir_operations;
 extern struct dentry_operations minix_dentry_operations;