use variable instead of relative path to file

diff --git a/lib/util.php b/lib/util.php
index 258f40e6bca95cc81bcf85a530eee0ecfe9bbc1e..55dc62a2b138f0633d0f40697fa544fd94772d33 100755 (executable)
--- a/lib/util.php
+++ b/lib/util.php
@@ -810,7 +810,7 @@ class OC_Util {
 
                if(is_null($theme)) {
                        
-                       if(is_dir(__DIR__ . '/../themes/default')) {
+                       if(is_dir(OC::$SERVERROOT . '/themes/default')) {
                                $theme = 'default';
                        }