diff --git a/modules/field/modules/field_sql_storage/field_sql_storage.module b/modules/field/modules/field_sql_storage/field_sql_storage.module
index 55c6a64d465d3a8f4542225e5658612349bc4a6b..d7270ff85ef9e35bba4c07a3cef895fd838c4cc7 100644
--- a/modules/field/modules/field_sql_storage/field_sql_storage.module
+++ b/modules/field/modules/field_sql_storage/field_sql_storage.module
@@ -91,7 +91,7 @@ function _field_sql_storage_schema($field) {
     'description' => 'Data storage for field ' . $field['field_name'],
     'fields' => array(
       'etid' => array(
-        'type' => 'serial',
+        'type' => 'int',
         'unsigned' => TRUE,
         'not null' => TRUE,
         'description' => 'The entity type id this data is attached to',