diff --git a/taskman.inc.php b/taskman.inc.php
index 7356ed4..19c6803 100644
--- a/taskman.inc.php
+++ b/taskman.inc.php
@@ -498,7 +498,7 @@ function _parse_taskstr($str)
 
 function _read_env_vars()
 {
-  $envs = getenv(null);
+  $envs = getenv();
 
   foreach($envs as $k => $v)
   {