diff --git a/gtk/gtkcombobox.c b/gtk/gtkcombobox.c
index 3caa1d74cd..98d3e0c356 100644
--- a/gtk/gtkcombobox.c
+++ b/gtk/gtkcombobox.c
@@ -2418,14 +2418,14 @@ gtk_combo_box_size_allocate (GtkWidget     *widget,
           gint width;
           guint border_width;
 
+          gtk_widget_size_allocate (priv->button, allocation);
+
           /* menu mode */
           allocation->x += padding.left;
           allocation->y += padding.top;
           allocation->width -= padding.left + padding.right;
           allocation->height -= padding.top + padding.bottom;
 
-          gtk_widget_size_allocate (priv->button, allocation);
-
           /* set some things ready */
           border_width = gtk_container_get_border_width (GTK_CONTAINER (priv->button));
           get_widget_padding (priv->button, &button_padding);