diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index e81488c4fb..023f0ceb3a 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -9468,6 +9468,10 @@ gtk_widget_set_tooltip_text (GtkWidget  *widget,
   priv->tooltip_text = tooltip_text;
   priv->tooltip_markup = tooltip_markup;
 
+  gtk_accessible_update_property (GTK_ACCESSIBLE (widget),
+                                  GTK_ACCESSIBLE_PROPERTY_DESCRIPTION, priv->tooltip_text,
+                                  -1);
+
   gtk_widget_set_has_tooltip (widget, priv->tooltip_text != NULL);
   if (_gtk_widget_get_visible (widget))
     gtk_widget_trigger_tooltip_query (widget);
@@ -9550,6 +9554,10 @@ gtk_widget_set_tooltip_markup (GtkWidget  *widget,
                           NULL);
     }
 
+  gtk_accessible_update_property (GTK_ACCESSIBLE (widget),
+                                  GTK_ACCESSIBLE_PROPERTY_DESCRIPTION, priv->tooltip_text,
+                                  -1);
+
   gtk_widget_set_has_tooltip (widget, tooltip_markup != NULL);
   if (_gtk_widget_get_visible (widget))
     gtk_widget_trigger_tooltip_query (widget);