diff --git a/htdocs/batch_process.php b/htdocs/batch_process.php
index b93b390..3c7a069 100644
--- a/htdocs/batch_process.php
+++ b/htdocs/batch_process.php
@@ -1,5 +1,6 @@
 <?php
 
+define("NO_SESSION", 1);
 define("SITE_ROOT", realpath(dirname(__file__)));
 require_once SITE_ROOT . "/lib/init.php";
 
@@ -67,3 +68,5 @@ if ($nr)
     $rp = $nr != 1 ? "reports" : "report";
     IRCNotify::send("#SingularityViewer", "[CrashProcessor] $nr new $rp. http://crash.singularityviewer.org/");
 }
+
+Session::GC();
diff --git a/htdocs/lib/Session.php b/htdocs/lib/Session.php
index 51b5b53..261eb8f 100644
--- a/htdocs/lib/Session.php
+++ b/htdocs/lib/Session.php
@@ -263,6 +263,11 @@ class Session
 	{
 		return ($this->authenticated && $this->user->isAdmin());
 	}
+	
+	static public function GC()
+	{
+		DBH::$db->query("delete from session where expires > current_timestamp");
+	}
 }
 
 /*
diff --git a/htdocs/sync_builds.php b/htdocs/sync_builds.php
index 2fb93ca..4a92aea 100644
--- a/htdocs/sync_builds.php
+++ b/htdocs/sync_builds.php
@@ -1,5 +1,6 @@
 <?php
 
+define("NO_SESSION", 1);
 define("SITE_ROOT", realpath(dirname(__file__)));
 require_once SITE_ROOT . "/lib/init.php";