diff --git a/Layout/default/Product/Index.php b/Layout/default/Product/Index.php
index 384cb2120..d68c0692b 100644
--- a/Layout/default/Product/Index.php
+++ b/Layout/default/Product/Index.php
@@ -49,7 +49,7 @@
                 <td><?=(count($product->networks)) ? array_shift($product->networks)->name . ((count($product->networks) > 1) ? ", ..." : "") : ""?></td>
                 <td><?=$product->productgroup->name?></td>
                 <td><?=$product->name?></td>
-                <td><?=$product->producttech->name?> (<?=$product->attributes['rtrcode']->value?>)</td>
+                <td><?=$product->producttech->name?> (<?=$product->attributes[TT_ATTRIB_RTRTECHCODE_NAME]->value?>)</td>
                 <td><?=__($product->producttech->customer_type)?></td>
                 <td><?=$product->price?></td>
                 <td><?=$product->billing_period?>x Jährlich</td>