diff --git a/modules/user/user.install b/modules/user/user.install
index 4e1a3c2..f300441 100644
--- a/modules/user/user.install
+++ b/modules/user/user.install
@@ -307,7 +307,7 @@ function user_install() {
     ->fields(array(
       'uid' => 1,
       'name' => 'placeholder-for-uid-1',
-      'mail' => 'placeholder-for-uid-1',
+      'mail' => 'placeholder-for-uid-1@example.com',
       'created' => REQUEST_TIME,
       'status' => 1,
       'data' => NULL,