diff --git a/rlgwebd.js b/rlgwebd.js
index 9ae33ee..90129df 100755
--- a/rlgwebd.js
+++ b/rlgwebd.js
@@ -20,6 +20,7 @@ var dropToUID = 501;
 var dropToGID = 501;
 var serveStaticRoot = "/var/www/"; // inside the chroot
 var passwdfile = "/dgldir/dgl-login";
+var playtimeout = 3600000; // Idle time before games are autosaved, in ms
 
 /* Global state */
 var sessions = {};
@@ -201,7 +202,7 @@ function TermSession(game, user, files, dims) {
   };
   this.cleanup = function () {
     /* Call this when the child is dead. */
-    if (this.alive)
+    if (ss.alive)
       return;
     ss.record.end();
     /* Give the client a chance to read any leftover data. */
@@ -318,6 +319,23 @@ function auth(username, password) {
   return true;
 }
 
+function reaper() {
+  var now = new Date();
+  function reapcheck(session) {
+    if (!session.alive)
+      return;
+    fs.fstat(session.record.fd, function (err, stats) {
+      if (!err && now - stats.mtime > playtimeout) {
+        tslog("Reaping %s", session.sessid);
+        session.close();
+      }
+    });
+  }
+  for (var sessid in sessions) {
+    reapcheck(sessions[sessid]);
+  }
+}
+
 function login(req, res, formdata) {
   if (!allowlogin) {
     sendError(res, 6, null);
@@ -754,5 +772,6 @@ ctlServer.listen(ctlsocket, function () {
   httpServer = http.createServer(webHandler);
   httpServer.listen(httpPort);
   tslog('rlgwebd running on port %d', httpPort); 
+  setInterval(reaper, playtimeout / 4);
 });