1 files changed, 2 insertions, 1 deletions
diff --git a/src/tree.c b/src/tree.c
index aaf513c6..03404b04 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -308,7 +308,8 @@ zenity_tree (ZenityData *data, ZenityTreeData *tree_data)
   else
     zenity_util_set_window_icon (dialog, ZENITY_IMAGE_FULLPATH ("zenity-list.png"));
 
-  gtk_window_set_default_size (GTK_WINDOW (dialog), data->width, data->height);
+  if (data->width > -1 || data->height > -1)
+    gtk_window_set_default_size (GTK_WINDOW (dialog), data->width, data->height);
 
   tree_view = glade_xml_get_widget (glade_dialog, "zenity_tree_view");