diff --git a/module/upgrade/config.php b/module/upgrade/config.php
index ea0dfe6bd8..51661c78f7 100644
--- a/module/upgrade/config.php
+++ b/module/upgrade/config.php
@@ -980,6 +980,22 @@ $config->delete['20_0_beta1'][] = 'extension/biz/workflow/js/flowchart.js';
 $config->delete['20_0_beta1'][] = 'extension/max/workflow/js/flowchart.js';
 $config->delete['20_0_beta1'][] = 'extension/biz/workflow/view/flowchart.html.php';
 $config->delete['20_0_beta1'][] = 'extension/max/workflow/view/flowchart.html.php';
+$config->delete['20_0_beta1'][] = 'extension/biz/workflowrule/ext/css/browse/flow.css';
+$config->delete['20_0_beta1'][] = 'extension/max/workflowrule/ext/css/browse/flow.css';
+$config->delete['20_0_beta1'][] = 'extension/biz/workflowrule/ext/css/create/flow.css';
+$config->delete['20_0_beta1'][] = 'extension/max/workflowrule/ext/css/create/flow.css';
+$config->delete['20_0_beta1'][] = 'extension/biz/workflowrule/ext/css/edit/flow.css';
+$config->delete['20_0_beta1'][] = 'extension/max/workflowrule/ext/css/edit/flow.css';
+$config->delete['20_0_beta1'][] = 'extension/biz/workflowrule/ext/model/flow.php';
+$config->delete['20_0_beta1'][] = 'extension/max/workflowrule/ext/model/flow.php';
+$config->delete['20_0_beta1'][] = 'extension/biz/workflowrule/ext/model/class/flow.class.php';
+$config->delete['20_0_beta1'][] = 'extension/max/workflowrule/ext/model/class/flow.class.php';
+$config->delete['20_0_beta1'][] = 'extension/biz/workflowrule/ext/view/browse.flow.html.hook.php';
+$config->delete['20_0_beta1'][] = 'extension/max/workflowrule/ext/view/browse.flow.html.hook.php';
+$config->delete['20_0_beta1'][] = 'extension/biz/workflowrule/ext/view/create.flow.html.hook.php';
+$config->delete['20_0_beta1'][] = 'extension/max/workflowrule/ext/view/create.flow.html.hook.php';
+$config->delete['20_0_beta1'][] = 'extension/biz/workflowrule/ext/view/edit.flow.html.hook.php';
+$config->delete['20_0_beta1'][] = 'extension/max/workflowrule/ext/view/edit.flow.html.hook.php';
 $config->delete['20_0_beta1'][] = 'extension/biz/my/ext/view/effort.calendar.html.hook.php';
 $config->delete['20_0_beta1'][] = 'extension/max/my/ext/view/effort.calendar.html.hook.php';
 $config->delete['20_0_beta1'][] = 'extension/biz/task/ext/view/view.effort.html.hook.php';