diff --git a/.travis.yml b/.travis.yml
index 7212567d..ecb70b19 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: php
 
-php: [5.6, 5.5, 5.4, hhvm]
+php: [5.6, 5.5, 5.4, 5.3, hhvm]
 
 install:
   - composer install --dev --prefer-source
diff --git a/src/Drupal/Driver/Cores/Drupal6.php b/src/Drupal/Driver/Cores/Drupal6.php
index 9db83186..8d022f85 100644
--- a/src/Drupal/Driver/Cores/Drupal6.php
+++ b/src/Drupal/Driver/Cores/Drupal6.php
@@ -413,7 +413,7 @@ protected function expandEntityFields($entity_type, \stdClass $entity) {
    * {@inheritDoc}
    */
   public function getEntityFieldTypes($entity_type) {
-    $taxonomy_fields = ['taxonomy' => 'taxonomy'];
+    $taxonomy_fields = array('taxonomy' => 'taxonomy');
     if (!module_exists('content')) {
       return $taxonomy_fields;
     }