diff --git a/plugins/Realtime/scripts/cleanupchannels.php b/plugins/Realtime/scripts/cleanupchannels.php
index 37883b1da6..4aa0a4ba50 100755
--- a/plugins/Realtime/scripts/cleanupchannels.php
+++ b/plugins/Realtime/scripts/cleanupchannels.php
@@ -20,7 +20,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-define('INSTALLDIR', realpath(dirname(__FILE__) . '/../..'));
+define('INSTALLDIR', realpath(__DIR__ . '/../../..'));
 
 $shortoptions = 'u';
 $longoptions = array('universe');