diff --git a/src/core/gcal-timeline.c b/src/core/gcal-timeline.c
index ec85cdfb..9040585d 100644
--- a/src/core/gcal-timeline.c
+++ b/src/core/gcal-timeline.c
@@ -681,7 +681,9 @@ gcal_timeline_finalize (GObject *object)
   g_clear_pointer (&self->calendars, g_hash_table_destroy);
   g_clear_pointer (&self->subscribers, g_hash_table_destroy);
   g_clear_pointer (&self->subscriber_ranges, gcal_range_tree_unref);
-  g_clear_pointer (&self->timeline_source, g_source_destroy);
+
+  g_source_destroy (self->timeline_source);
+  g_clear_pointer (&self->timeline_source, g_source_unref);
 
   if (self->event_queue)
     {