diff -Nru update-notifier-0.150/debian/changelog update-notifier-0.151/debian/changelog
--- update-notifier-0.150/debian/changelog	2014-01-08 13:36:58.000000000 -0500
+++ update-notifier-0.151/debian/changelog	2014-01-11 09:28:44.000000000 -0500
@@ -1,3 +1,10 @@
+update-notifier (0.151) trusty; urgency=low
+
+  * If there are no updates available, still nag the user if a reboot is
+    required, in case the notification window was dismissed. (LP: #1033226)
+
+ -- Marc Deslauriers <marc.deslauriers@ubuntu.com>  Sat, 11 Jan 2014 09:28:25 -0500
+
 update-notifier (0.150) trusty; urgency=low
 
   * Update the location of apport/autoreport from /etc to /var/lib.
diff -Nru update-notifier-0.150/src/update.c update-notifier-0.151/src/update.c
--- update-notifier-0.150/src/update.c	2013-07-12 13:07:51.000000000 -0400
+++ update-notifier-0.151/src/update.c	2014-01-11 09:35:47.000000000 -0500
@@ -399,8 +399,8 @@
 			 time_t last_launch)
 {
 
-   // no security updates
-   if (priv->num_security == 0)
+   // no security updates and no reboot pending
+   if ((priv->num_security == 0) && !priv->reboot_pending)
       return FALSE;
 	 
    // security updates, but already launched recently
@@ -550,6 +550,7 @@
 
    priv->num_upgrades = 0;
    priv->num_security = 0;
+   priv->reboot_pending = FALSE;
    int exit_status = 0;
    GError *error = NULL;
 
@@ -558,6 +559,7 @@
 		   UPGRADE_CHECKER, 
 		   NULL };
    char *ret;
+   struct stat buf;
 
    if(g_spawn_sync(NULL, cmd, NULL,  
 		   G_SPAWN_STDOUT_TO_DEV_NULL, 
@@ -615,10 +617,13 @@
    
    g_debug_update("%s returned %i (security: %i)", UPGRADE_CHECKER, priv->num_upgrades, priv->num_security);
 
-   if (priv->num_upgrades == 0) {
+   if (stat("/var/run/reboot-required", &buf) == 0) {
+      priv->reboot_pending = TRUE;
+      g_debug_update("A reboot is currently pending.");
+   }
 
+   if ((priv->num_upgrades == 0) && !priv->reboot_pending) {
       // check if the periodic file is very old
-      struct stat buf;
       if ((stat("/var/lib/apt/periodic/update-success-stamp", &buf) == 0) &&
 	  (time(NULL) - buf.st_mtime > OUTDATED_NAG_AGE) ) 
 	 g_timeout_add_seconds(OUTDATED_NAG_WAIT, (GSourceFunc)outdated_nag, ta);
diff -Nru update-notifier-0.150/src/update.h update-notifier-0.151/src/update.h
--- update-notifier-0.150/src/update.h	2013-07-12 13:07:51.000000000 -0400
+++ update-notifier-0.151/src/update.h	2014-01-11 09:21:40.000000000 -0500
@@ -18,4 +18,5 @@
    
    int num_upgrades;
    int num_security;
+   gboolean reboot_pending;
 };