use variable instead of relative path to file

diff --git a/lib/util.php b/lib/util.php
index 987a5782779a434ed598785d70b8b5d23eae7e67..810593358a5e2d352eedae0ef2c119913955d162 100755 (executable)
--- a/lib/util.php
+++ b/lib/util.php
@@ -806,7 +806,7 @@ class OC_Util {
 
                if(is_null($theme)) {
                        
-                       if(is_dir(__DIR__ . '/../themes/default')) {
+                       if(is_dir(OC::$SERVERROOT . '/themes/default')) {
                                $theme = 'default';
                        }