diff -urN a/fs/reiser4/plugin/node/node40.h b/fs/reiser4/plugin/node/node40.h
--- a/fs/reiser4/plugin/node/node40.h	2005-07-27 18:14:04.000000000 -0400
+++ b/fs/reiser4/plugin/node/node40.h	2005-07-27 18:14:53.000000000 -0400
@@ -80,7 +80,7 @@
 int check_node40(const znode * node, __u32 flags, const char **error);
 int parse_node40(znode * node);
 int init_node40(znode * node);
-#if GUESS_EXISTS
+#ifdef GUESS_EXISTS
 int guess_node40(const znode * node);
 #endif
 void change_item_size_node40(coord_t * coord, int by);