diff --git a/password_policy.install b/password_policy.install
index 3e95902..37193a7 100644
--- a/password_policy.install
+++ b/password_policy.install
@@ -172,6 +172,7 @@ function password_policy_schema() {
           'columns' => array('uid' => 'uid'),
         ),
       ),
+      'primary key' => array('uid'),
       'indexes' => array('uid' => array('uid')),
     ),
     'password_policy_role' => array(
@@ -447,3 +448,9 @@ function password_policy_update_7105() {
     }
   }
 }
+/**
+ * add primary key to password_policy_force_change table
+ */
+function password_policy_update_7106() {
+  db_add_primary_key('password_policy_force_change', array('uid'));
+}