diff --git a/modules/salesforce_mapping/salesforce_mapping.install b/modules/salesforce_mapping/salesforce_mapping.install
index 6c38209..77fbfb6 100644
--- a/modules/salesforce_mapping/salesforce_mapping.install
+++ b/modules/salesforce_mapping/salesforce_mapping.install
@@ -204,7 +204,6 @@ function salesforce_mapping_schema() {
       'salesforce_object' => array('salesforce_id'),
     ),
     'unique keys' => array(
-      'salesforce' => array('salesforce_id'),
       'salesforce_drupal' => array('entity_type', 'entity_id'),
     ),
   );