diff --git a/gtk/deprecated/gtktrayicon-x11.c b/gtk/deprecated/gtktrayicon-x11.c
index 02310a9ad1..556b9da696 100644
--- a/gtk/deprecated/gtktrayicon-x11.c
+++ b/gtk/deprecated/gtktrayicon-x11.c
@@ -551,6 +551,7 @@ gtk_tray_icon_get_colors_property (GtkTrayIcon *icon)
     {
       GdkRGBA color;
 
+      color.alpha = 1.0;
       g_object_freeze_notify (G_OBJECT (icon));
 
       color.red = prop.prop[0] / 65535.0;