diff --git a/include/linux/posix_acl_xattr.h b/include/linux/posix_acl_xattr.h
index 6e53c34..8bd5fcf 100644
--- a/include/linux/posix_acl_xattr.h
+++ b/include/linux/posix_acl_xattr.h
@@ -52,6 +52,18 @@
 	return size / sizeof(posix_acl_xattr_entry);
 }
 
+#ifdef CONFIG_FS_POSIX_ACL
+void posix_acl_fix_xattr_from_user(void *value, size_t size);
+void posix_acl_fix_xattr_to_user(void *value, size_t size);
+#else
+static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
+{
+}
+static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
+{
+}
+#endif
+
 struct posix_acl *posix_acl_from_xattr(const void *value, size_t size);
 int posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size);