diff -Naur mate-system-monitor-1.8.0-old/src/callbacks.cpp mate-system-monitor-1.8.0/src/callbacks.cpp
--- mate-system-monitor-1.8.0-old/src/callbacks.cpp	2014-01-25 18:04:53.000000000 +0200
+++ mate-system-monitor-1.8.0/src/callbacks.cpp	2014-03-26 00:31:20.911847006 +0200
@@ -180,7 +180,7 @@
 cb_help_contents (GtkAction *action, gpointer data)
 {
     GError* error = 0;
-    if (!g_app_info_launch_default_for_uri("help:mate-system-monitor", NULL, &error)) {
+    if (!g_app_info_launch_default_for_uri("http://mate-desktop.org/", NULL, &error)) {
         g_warning("Could not display help : %s", error->message);
         g_error_free(error);
     }