diff --git a/gtk/gtkfilesystemmodel.c b/gtk/gtkfilesystemmodel.c
index 07f3685bf0..00a531b61d 100644
--- a/gtk/gtkfilesystemmodel.c
+++ b/gtk/gtkfilesystemmodel.c
@@ -830,6 +830,12 @@ gtk_file_system_model_dispose (GObject *object)
 {
   GtkFileSystemModel *model = GTK_FILE_SYSTEM_MODEL (object);
 
+  if (model->dir_thaw_source)
+    {
+      g_source_remove (model->dir_thaw_source);
+      model->dir_thaw_source = 0;
+    }
+
   g_cancellable_cancel (model->cancellable);
   if (model->dir_monitor)
     g_file_monitor_cancel (model->dir_monitor);