diff --git a/ext/simplexml/config.m4 b/ext/simplexml/config.m4
index ea861491fda..80b9e3c52e7 100644
--- a/ext/simplexml/config.m4
+++ b/ext/simplexml/config.m4
@@ -2,7 +2,7 @@ dnl $Id$
 dnl config.m4 for extension simplexml
 
 PHP_ARG_WITH(simplexml, for simplexml support,
-[  --with-simplexml       Include simplexml support], yes)
+[  --with-simplexml       Include simplexml support])
 
 if test "$PHP_SIMPLEXML" != "no"; then