diff -Naurp rrdtool.orig/php4/rrdtool.c rrdtool/php4/rrdtool.c
--- rrdtool.orig/php4/rrdtool.c	2007-06-16 01:32:23.000000000 -0400
+++ rrdtool/php4/rrdtool.c	2008-04-05 23:37:04.000000000 -0400
@@ -381,7 +381,7 @@ PHP_FUNCTION(rrd_update)
 		argv[3] = estrdup(opt->value.str.val);
 
 		optind = 0; opterr = 0;
-		if ( rrd_update(3, &argv[1]) != -1 )
+		if ( rrd_update(2, &argv[2]) != -1 )
 		{
 			RETVAL_TRUE;
 		}