diff --git a/.travis.yml b/.travis.yml
index 85ba4794..454942ab 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,6 +16,7 @@ install:
   - composer install --dev --prefer-source
 
 script:
+  - find ./src -name "*.php" -print0 | xargs -0 -n1 -P8 php -l
   - phpunit
   - vendor/bin/phpspec run -f pretty --no-interaction
   - ./vendor/bin/phpcs --standard=./phpcs-ruleset.xml --ignore=./vendor --ignore=./doc --ignore=./spec .
diff --git a/src/Drupal/Driver/Fields/Drupal6/TaxonomyHandler.php b/src/Drupal/Driver/Fields/Drupal6/TaxonomyHandler.php
index 7d5cc5b1..7c635870 100644
--- a/src/Drupal/Driver/Fields/Drupal6/TaxonomyHandler.php
+++ b/src/Drupal/Driver/Fields/Drupal6/TaxonomyHandler.php
@@ -18,7 +18,7 @@ class TaxonomyHandler implements FieldHandlerInterface {
    * {@inheritdoc}
    */
   public function expand($values) {
-    $result = [];
+    $result = array();
     $values = (array) $values;
     foreach ($values as $entry) {
       $terms = explode(',', $entry);