diff --git a/src/Admin/GridFieldCategorisationConfig.php b/src/Admin/GridFieldCategorisationConfig.php
index eac622e..e62c4ee 100644
--- a/src/Admin/GridFieldCategorisationConfig.php
+++ b/src/Admin/GridFieldCategorisationConfig.php
@@ -16,7 +16,7 @@ class GridFieldCategorisationConfig extends GridFieldConfig_RecordEditor
      * @param string $parentMethod
      * @param string $childMethod
      */
-    public function __construct($itemsPerPage = 15, $mergeRecords, $parentType, $parentMethod, $childMethod)
+    public function __construct($itemsPerPage, $mergeRecords, $parentType, $parentMethod, $childMethod)
     {
         parent::__construct($itemsPerPage);
 
diff --git a/src/Admin/GridFieldMergeAction.php b/src/Admin/GridFieldMergeAction.php
index d2c5fd5..fab3dc9 100644
--- a/src/Admin/GridFieldMergeAction.php
+++ b/src/Admin/GridFieldMergeAction.php
@@ -48,7 +48,7 @@ class GridFieldMergeAction implements GridField_ColumnProvider, GridField_Action
      * @param string $parentMethod
      * @param string $childMethod
      */
-    public function __construct($records = [], $parentType, $parentMethod, $childMethod)
+    public function __construct($records, $parentType, $parentMethod, $childMethod)
     {
         $this->records = $records;
         $this->parentType = $parentType;