diff --git a/SalesGraph.php b/SalesGraph.php
index 5b7e0f2e6..ecafa1bc8 100644
--- a/SalesGraph.php
+++ b/SalesGraph.php
@@ -208,10 +208,10 @@
 	$GraphTitle ='';
 	if ($_POST['GraphValue']=='Net') {
 		$GraphTitle = _('Sales Value');
-		$SelectClause = 'amt';
+		$SelectClause = 'amt - disc';
 	} elseif ($_POST['GraphValue']=='GP'){
 		$GraphTitle = _('Gross Profit');
-		$SelectClause = '(amt - cost)';
+		$SelectClause = '(amt - disc - cost)';
 	} else {
 		$GraphTitle = _('Unit Sales');
 		$SelectClause = 'qty';