diff --git a/library/HTMLPurifier/AttrDef/CSS/Color.php b/library/HTMLPurifier/AttrDef/CSS/Color.php
index cecfbb8c..d7287a00 100644
--- a/library/HTMLPurifier/AttrDef/CSS/Color.php
+++ b/library/HTMLPurifier/AttrDef/CSS/Color.php
@@ -59,19 +59,19 @@ class HTMLPurifier_AttrDef_CSS_Color extends HTMLPurifier_AttrDef
              * Allowed types for values :
              * parameter_position => [type => max_value]
              */
-            $allowed_types = [
-                1 => ['percentage' => 100, 'integer' => 255],
-                2 => ['percentage' => 100, 'integer' => 255],
-                3 => ['percentage' => 100, 'integer' => 255],
-            ];
+            $allowed_types = array(
+                1 => array('percentage' => 100, 'integer' => 255),
+                2 => array('percentage' => 100, 'integer' => 255),
+                3 => array('percentage' => 100, 'integer' => 255),
+            );
             $allow_different_types = false;
 
             if (strpos($function, 'hsl') !== false) {
-                $allowed_types = [
-                    1 => ['integer' => 360],
-                    2 => ['percentage' => 100],
-                    3 => ['percentage' => 100],
-                ];
+                $allowed_types = array(
+                    1 => array('integer' => 360),
+                    2 => array('percentage' => 100),
+                    3 => array('percentage' => 100),
+                );
                 $allow_different_types = true;
             }