diff --git a/gdk/quartz/gdkeventloop-quartz.c b/gdk/quartz/gdkeventloop-quartz.c
index 9f87371a20..f11d4d88e7 100644
--- a/gdk/quartz/gdkeventloop-quartz.c
+++ b/gdk/quartz/gdkeventloop-quartz.c
@@ -987,6 +987,7 @@ _gdk_quartz_event_loop_init (void)
   event_poll_fd.fd = -1;
 
   source = g_source_new (&event_funcs, sizeof (GSource));
+  g_source_set_name (source, "GDK Quartz event source"); 
   g_source_add_poll (source, &event_poll_fd);
   g_source_set_priority (source, GDK_PRIORITY_EVENTS);
   g_source_set_can_recurse (source, TRUE);
diff --git a/gdk/win32/gdkevents-win32.c b/gdk/win32/gdkevents-win32.c
index 3773e4dc20..1c1e9d57e1 100644
--- a/gdk/win32/gdkevents-win32.c
+++ b/gdk/win32/gdkevents-win32.c
@@ -377,6 +377,7 @@ _gdk_events_init (void)
 #endif
 
   source = g_source_new (&event_funcs, sizeof (GSource));
+  g_source_set_name (source, "GDK Win32 event source"); 
   g_source_set_priority (source, GDK_PRIORITY_EVENTS);
 
 #ifdef G_WITH_CYGWIN
diff --git a/gdk/x11/gdkevents-x11.c b/gdk/x11/gdkevents-x11.c
index 1f27497f3f..2f096a1adf 100644
--- a/gdk/x11/gdkevents-x11.c
+++ b/gdk/x11/gdkevents-x11.c
@@ -142,7 +142,12 @@ gdk_display_source_new (GdkDisplay *display)
 {
   GSource *source = g_source_new (&event_funcs, sizeof (GdkDisplaySource));
   GdkDisplaySource *display_source = (GdkDisplaySource *)source;
+  char *name;
   
+  name = g_strdup_printf ("GDK X11 Event source (%s)",
+			  gdk_display_get_name (display));
+  g_source_set_name (source, name);
+  g_free (name);
   display_source->display = display;
   
   return source;
diff --git a/modules/printbackends/cups/gtkprintbackendcups.c b/modules/printbackends/cups/gtkprintbackendcups.c
index 3924871196..4b26cba5d3 100644
--- a/modules/printbackends/cups/gtkprintbackendcups.c
+++ b/modules/printbackends/cups/gtkprintbackendcups.c
@@ -1248,6 +1248,7 @@ cups_request_execute (GtkPrintBackendCups              *print_backend,
 
   dispatch = (GtkPrintCupsDispatchWatch *) g_source_new (&_cups_dispatch_watch_funcs, 
                                                          sizeof (GtkPrintCupsDispatchWatch));
+  g_source_set_name (dispatch, "GTK+ CUPS backend");
 
   GTK_NOTE (PRINTING,
             g_print ("CUPS Backend: %s <source %p> - Executing cups request on server '%s' and resource '%s'\n", G_STRFUNC, dispatch, request->server, request->resource));