diff --git a/Classes/PHPExcel/Style/Border.php b/Classes/PHPExcel/Style/Border.php
index 55efc501e..f0d8dd1f7 100644
--- a/Classes/PHPExcel/Style/Border.php
+++ b/Classes/PHPExcel/Style/Border.php
@@ -151,7 +151,7 @@ public function getStyleArray($array)
             case 'right':
             case 'top':
             case 'vertical':
-                $key = strtolower('vertical');
+                $key = strtolower($this->parentPropertyName);
                 break;
         }
         return $this->parent->getStyleArray(array($key => $array));