diff --git a/Drupal_Apache_Solr_Service.php b/Drupal_Apache_Solr_Service.php
index 35ba377..81f36aa 100644
--- a/Drupal_Apache_Solr_Service.php
+++ b/Drupal_Apache_Solr_Service.php
@@ -695,7 +695,7 @@ class DrupalApacheSolrService implements DrupalApacheSolrServiceInterface {
     $flushValue = $waitFlush ? 'true' : 'false';
     $searcherValue = $waitSearcher ? 'true' : 'false';
 
-    $rawPost = '<commit optimize="' . $optimizeValue . '" waitFlush="' . $flushValue . '" waitSearcher="' . $searcherValue . '" />';
+    $rawPost = '<commit waitSearcher="' . $searcherValue . '" />';
 
     $response = $this->update($rawPost, $timeout);
     $this->_clearCache();
@@ -768,7 +768,7 @@ class DrupalApacheSolrService implements DrupalApacheSolrServiceInterface {
     $flushValue = $waitFlush ? 'true' : 'false';
     $searcherValue = $waitSearcher ? 'true' : 'false';
 
-    $rawPost = '<optimize waitFlush="' . $flushValue . '" waitSearcher="' . $searcherValue . '" />';
+    $rawPost = '<optimize waitSearcher="' . $searcherValue . '" />';
 
     return $this->update($rawPost, $timeout);
   }