diff --git a/relaxng.c b/relaxng.c
index b1c2e00..ad15718 100644
--- a/relaxng.c
+++ b/relaxng.c
@@ -7405,6 +7405,7 @@
     return(0);
 }
 
+#ifdef LIBXML_OUTPUT_ENABLED
 /************************************************************************
  * 									*
  * 			Dump back a compiled form			*
@@ -7635,6 +7636,7 @@
 	xmlDocDump(output, schema->doc); 
     }
 }
+#endif /* LIBXML_OUTPUT_ENABLED */
 
 /************************************************************************
  * 									*