diff --git a/platform/install.provision.inc b/platform/install.provision.inc
index 3f5ac42bd960ace5ce8bc5c24da4ffdf6eb45936..328c9db9f56a140fd107ad7049afe18a8067d392 100644
--- a/platform/install.provision.inc
+++ b/platform/install.provision.inc
@@ -54,7 +54,7 @@ function drush_provision_drupal_provision_install() {
 function drush_provision_drupal_provision_install_rollback() {
   if (drush_get_option('uri')) {
     if (!_provision_drupal_site_installed()) {
-      _provision_recursive_delete('sites/' drush_get_option('uri'));
+      _provision_recursive_delete('sites/' . drush_get_option('uri'));
     }
   } else {
     drush_set_error('PROVISION_FRAMEWORK_ERROR', dt('no url defined in %function', array('%function' => __FUNCTION__)));