diff --git a/omega_tools.module b/omega_tools.module
index 0e10e85..056a5f3 100644
--- a/omega_tools.module
+++ b/omega_tools.module
@@ -472,7 +472,7 @@ function omega_tools_sites() {
       include(DRUPAL_ROOT . '/sites/sites.php');
     }
     
-    $sites = array('all') + array_values($sites);
+    $sites = array_merge(array('all'), array_values($sites));
   }
   
   return $sites;
@@ -643,4 +643,4 @@ function _omega_tools_is_editable($theme) {
   }
   
   return FALSE;
-}
\ No newline at end of file
+}