diff --git a/modules/salesforce/salesforce_api/salesforce_api.install b/modules/salesforce/salesforce_api/salesforce_api.install
index 769f00b..e09c534 100644
--- a/modules/salesforce/salesforce_api/salesforce_api.install
+++ b/modules/salesforce/salesforce_api/salesforce_api.install
@@ -77,7 +77,7 @@ function salesforce_api_schema() {
     'indexes' => array(
       'sfid' => array('sfid'),
     ),
-    'primary key' => array('drupal_type', 'oid'),
+    'primary key' => array('oid'),
   );
   $schema['salesforce_field_map'] = array(
     'description' => 'Drupal to Salesforce field mappings',