diff --git a/tree.h b/tree.h
index ce86711..08321a2 100644
--- a/tree.h
+++ b/tree.h
@@ -169,6 +169,7 @@
     const xmlChar            *name;	/* Element name */
     struct _xmlElementContent *c1;	/* first child */
     struct _xmlElementContent *c2;	/* second child */
+    struct _xmlElementContent *parent;	/* parent */
 };
 
 typedef enum {