diff --git a/gtk/gtkdragdest.c b/gtk/gtkdragdest.c
index 8f4261b4c8..d0a242316a 100644
--- a/gtk/gtkdragdest.c
+++ b/gtk/gtkdragdest.c
@@ -185,6 +185,8 @@ gtk_drag_dest_set (GtkWidget            *widget,
  *   subwindow.
  *
  * Sets this widget as a proxy for drops to another window.
+ *
+ * Deprecated: 3.22
  */
 void
 gtk_drag_dest_set_proxy (GtkWidget       *widget,
diff --git a/gtk/gtkdragdest.h b/gtk/gtkdragdest.h
index 6a91404fec..dd2e81355f 100644
--- a/gtk/gtkdragdest.h
+++ b/gtk/gtkdragdest.h
@@ -73,7 +73,7 @@ void gtk_drag_dest_set   (GtkWidget            *widget,
                           gint                  n_targets,
                           GdkDragAction         actions);
 
-GDK_AVAILABLE_IN_ALL
+GDK_DEPRECATED_IN_3_22
 void gtk_drag_dest_set_proxy (GtkWidget      *widget,
                               GdkWindow      *proxy_window,
                               GdkDragProtocol protocol,