--- pbx.c	2011-05-18 08:14:08.000000000 -0300
+++ pbx.c.bak	2011-05-18 08:17:54.000000000 -0300
@@ -3533,9 +3533,9 @@
 		if (acfptr->mod) {
 			u = __ast_module_user_add(acfptr->mod, chan);
 		}
+		ast_str_reset(*str);
 		if (acfptr->read2) {
 			/* ast_str enabled */
-			ast_str_reset(*str);
 			res = acfptr->read2(chan, copy, args, str, maxlen);
 		} else {
 			/* Legacy function pointer, allocate buffer for result */