diff --git a/src/wp-admin/network/site-users.php b/src/wp-admin/network/site-users.php
index ae34c4771a..cccb115393 100644
--- a/src/wp-admin/network/site-users.php
+++ b/src/wp-admin/network/site-users.php
@@ -50,7 +50,7 @@ if ( ! $id )
 
 $details = get_blog_details( $id );
 if ( ! $details ) {
-	wp_die( __( 'The requested site does not exist' ) );
+	wp_die( __( 'The requested site does not exist.' ) );
 }
 
 if ( ! can_edit_network( $details->site_id ) )