diff --git a/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/FirewallController.php b/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/FirewallController.php
index 5ca7cbb19..8bb290b43 100644
--- a/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/FirewallController.php
+++ b/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/FirewallController.php
@@ -54,7 +54,7 @@ class FirewallController extends IndexController
      */
     protected function templateCSSIncludes()
     {
-        return array_merge(parent::templateJSIncludes(), ['/css/jqtree.css']);
+        return array_merge(parent::templateCSSIncludes(), ['/css/jqtree.css']);
     }
 
     /**
diff --git a/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/SystemController.php b/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/SystemController.php
index 6faff500f..266dea8cd 100644
--- a/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/SystemController.php
+++ b/src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/SystemController.php
@@ -52,7 +52,7 @@ class SystemController extends IndexController
      */
     protected function templateCSSIncludes()
     {
-        return array_merge(parent::templateJSIncludes(), ['/css/jqtree.css']);
+        return array_merge(parent::templateCSSIncludes(), ['/css/jqtree.css']);
     }
 
     public function memoryAction()