diff --git a/src/extensions/MarkdownDataObjectExtension.php b/src/extensions/MarkdownDataObjectExtension.php
index df33c87..b252f38 100644
--- a/src/extensions/MarkdownDataObjectExtension.php
+++ b/src/extensions/MarkdownDataObjectExtension.php
@@ -37,10 +37,10 @@ public function updateCMSFields(FieldList $fields)
                 $description = $field->description;
                 $attributes = $field->attributes;
 
-                $row = 30;
+                $rows = 30;
 
                 if (array_key_exists('rows', $attributes)) {
-                    $row = $attributes['rows'];
+                    $rows = $attributes['rows'];
                 }
 
                 $markdownField = MarkdownEditorField::create($name, $title)