diff --git a/commands/core/drupal/batch.inc b/commands/core/drupal/batch.inc
index 574df084f4..f353ef1362 100644
--- a/commands/core/drupal/batch.inc
+++ b/commands/core/drupal/batch.inc
@@ -13,11 +13,12 @@ use Drush\Log\LogLevel;
  * Saves a record of the batch into the database, and progressively call $command to
  * process the operations.
  *
- * @param command
+ * @param string $command
  *    The command to call to process the batch.
- *
+ * @param array $args
+ * @param array $options
  */
-function _drush_backend_batch_process($command = 'batch-process', $args, $options) {
+function _drush_backend_batch_process($command, $args, $options) {
   $batch =& batch_get();
 
   if (isset($batch)) {
diff --git a/commands/core/drupal/batch_6.inc b/commands/core/drupal/batch_6.inc
index 11bbb5a8f2..f586ee3dc7 100644
--- a/commands/core/drupal/batch_6.inc
+++ b/commands/core/drupal/batch_6.inc
@@ -12,11 +12,12 @@ use Drush\Log\LogLevel;
  * Saves a record of the batch into the database, and progressively call $command to
  * process the operations.
  *
- * @param command
+ * @param string $command
  *    The command to call to process the batch.
- *
+ * @param array $args
+ * @param array $options
  */
-function _drush_backend_batch_process($command = 'batch-process', $args, $options) {
+function _drush_backend_batch_process($command, $args, $options) {
   $batch =& batch_get();
 
   if (isset($batch)) {
diff --git a/commands/core/drupal/batch_7.inc b/commands/core/drupal/batch_7.inc
index bbb2089d28..6f3a6d1020 100644
--- a/commands/core/drupal/batch_7.inc
+++ b/commands/core/drupal/batch_7.inc
@@ -12,11 +12,12 @@ use Drush\Log\LogLevel;
  * Saves a record of the batch into the database, and progressively call $command to
  * process the operations.
  *
- * @param command
+ * @param string $command
  *    The command to call to process the batch.
- *
+ * @param array $args
+ * @param array $options
  */
-function _drush_backend_batch_process($command = 'batch-process', $args, $options) {
+function _drush_backend_batch_process($command, $args, $options) {
   $batch =& batch_get();
 
   if (isset($batch)) {