diff --git a/src/Handler.php b/src/Handler.php
index 9b58f83447d6b8774fe3b40c24337840adc0231c..1c34d450bc491c4e08b8ec526c66a8a562f65c26 100644
--- a/src/Handler.php
+++ b/src/Handler.php
@@ -227,7 +227,7 @@ class Handler extends BaseHandler {
         $env->put('COMPOSE_PROJECT_NAME', $projectname);
       }
       $extra = $this->composer->getPackage()->getExtra() + ['docker4drupal' => []];
-      $options = NestedArray::mergeDeep([
+      $options = NestedArray::mergeDeep($extra['docker4drupal'], [
         'projectname' => $projectname,
         'ci_home' => '/home/gitlab-runner',
         'docker0' => [
@@ -309,7 +309,7 @@ class Handler extends BaseHandler {
         'wkhtmltox' => [
           'enable' => 0,
         ],
-      ], $extra['docker4drupal']);
+      ]);
 
       if ($this->isCiContext() || $this->isLocalDevMode()) {
         $projectRoot = $this->getDockerMountSource(getenv('CI_PROJECT_DIR'));