diff --git a/application/models/UpdateForm.php b/application/models/UpdateForm.php
index c0b4caee42a..7647f9258d8 100644
--- a/application/models/UpdateForm.php
+++ b/application/models/UpdateForm.php
@@ -799,7 +799,7 @@ private function fileSystemCheck($obj)
         } else {
             $check->writable = 'pass';
         }
-        if ($obj->freespaceCheck) {
+        if ($obj->freespaceCheck && function_exists('disk_free_space')) {
             $check->freespace = (@disk_free_space($obj->name) > $obj->minfreespace);
         } else {
             $check->freespace = 'pass';