diff --git a/src/compositor/meta-window-actor-x11.c b/src/compositor/meta-window-actor-x11.c
index 92a3c73ab..aeaf1cfbe 100644
--- a/src/compositor/meta-window-actor-x11.c
+++ b/src/compositor/meta-window-actor-x11.c
@@ -1090,11 +1090,20 @@ update_frame_bounds (MetaWindowActorX11 *actor_x11)
 {
   MetaWindow *window =
     meta_window_actor_get_meta_window (META_WINDOW_ACTOR (actor_x11));
-  MtkRegion *frame_bounds = meta_window_get_frame_bounds (window);
+  MetaWindowX11 *window_x11 = META_WINDOW_X11 (window);
+  MetaWindowX11Private *priv = meta_window_x11_get_private (window_x11);
+
   g_clear_pointer (&actor_x11->frame_bounds, mtk_region_unref);
 
-  if (frame_bounds)
-    actor_x11->frame_bounds = mtk_region_copy (frame_bounds);
+ if (!priv->frame_bounds)
+    {
+      MetaFrame *frame = meta_window_x11_get_frame (window);
+      if (frame)
+        priv->frame_bounds = meta_frame_get_frame_bounds (frame);
+    }
+
+  if (priv->frame_bounds)
+    actor_x11->frame_bounds = mtk_region_copy (priv->frame_bounds);
 }
 
 static void
diff --git a/src/core/window-private.h b/src/core/window-private.h
index ef3fed811..082e54d28 100644
--- a/src/core/window-private.h
+++ b/src/core/window-private.h
@@ -278,9 +278,6 @@ struct _MetaWindow
     MetaLogicalMonitor *right;
   } fullscreen_monitors;
 
-  /* if non-NULL, the bounds of the window frame */
-  MtkRegion *frame_bounds;
-
   /* _NET_WM_WINDOW_OPACITY rescaled to 0xFF */
   guint8 opacity;
 
diff --git a/src/core/window.c b/src/core/window.c
index b82c107f4..67dc56bd7 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -99,6 +99,10 @@
 #include "wayland/meta-window-wayland.h"
 #endif
 
+#ifdef HAVE_X11_CLIENT
+#include "x11/window-x11-private.h"
+#endif
+
 #ifdef HAVE_XWAYLAND
 #include "wayland/meta-window-xwayland.h"
 #endif
@@ -315,8 +319,6 @@ meta_window_finalize (GObject *object)
 {
   MetaWindow *window = META_WINDOW (object);
 
-  g_clear_pointer (&window->frame_bounds, mtk_region_unref);
-
   if (window->transient_for)
     g_object_unref (window->transient_for);
 
@@ -3992,8 +3994,16 @@ meta_window_move_resize_internal (MetaWindow          *window,
       meta_window_update_monitor (window, update_monitor_flags);
     }
 
-  if ((result & META_MOVE_RESIZE_RESULT_FRAME_SHAPE_CHANGED) && window->frame_bounds)
-    g_clear_pointer (&window->frame_bounds, mtk_region_unref);
+#ifdef HAVE_X11_CLIENT
+  if (window->client_type == META_WINDOW_CLIENT_TYPE_X11)
+    {
+      MetaWindowX11 *window_x11 = META_WINDOW_X11 (window);
+      MetaWindowX11Private *priv = meta_window_x11_get_private (window_x11);
+
+      if ((result & META_MOVE_RESIZE_RESULT_FRAME_SHAPE_CHANGED) && priv->frame_bounds)
+        g_clear_pointer (&priv->frame_bounds, mtk_region_unref);
+    }
+#endif
 
   meta_window_foreach_transient (window, maybe_move_attached_window, NULL);
 
@@ -6791,34 +6801,6 @@ meta_window_get_frame_type (MetaWindow *window)
     }
 }
 
-/**
- * meta_window_get_frame_bounds:
- * @window: a #MetaWindow
- *
- * Gets a region representing the outer bounds of the window's frame.
- *
- * Return value: (transfer none) (nullable): a #MtkRegion
- *  holding the outer bounds of the window, or %NULL if the window
- *  doesn't have a frame.
- */
-MtkRegion *
-meta_window_get_frame_bounds (MetaWindow *window)
-{
-  if (!window->frame_bounds)
-    {
-#ifdef HAVE_X11_CLIENT
-      MetaFrame *frame = meta_window_x11_get_frame (window);
-#else
-      /* Only for now, as this method would be moved to a window-x11 in the upcoming commits */
-      MetaFrame *frame = NULL;
-#endif
-      if (frame)
-        window->frame_bounds = meta_frame_get_frame_bounds (frame);
-    }
-
-  return window->frame_bounds;
-}
-
 /**
  * meta_window_is_attached_dialog:
  * @window: a #MetaWindow
diff --git a/src/meta/window.h b/src/meta/window.h
index c6e6a028b..63da5eac7 100644
--- a/src/meta/window.h
+++ b/src/meta/window.h
@@ -343,9 +343,6 @@ const char *meta_window_get_mutter_hints (MetaWindow *window);
 META_EXPORT
 MetaFrameType meta_window_get_frame_type (MetaWindow *window);
 
-META_EXPORT
-MtkRegion *meta_window_get_frame_bounds (MetaWindow *window);
-
 META_EXPORT
 MetaWindow *meta_window_get_tile_match (MetaWindow *window);
 
diff --git a/src/x11/meta-x11-frame.c b/src/x11/meta-x11-frame.c
index 9b4449863..843230e0b 100644
--- a/src/x11/meta-x11-frame.c
+++ b/src/x11/meta-x11-frame.c
@@ -242,7 +242,7 @@ meta_window_destroy_frame (MetaWindow *window)
   meta_x11_display_unregister_x_window (x11_display, frame->xwindow);
 
   priv->frame = NULL;
-  g_clear_pointer (&window->frame_bounds, mtk_region_unref);
+  g_clear_pointer (&priv->frame_bounds, mtk_region_unref);
   g_clear_pointer (&frame->opaque_region, mtk_region_unref);
 
   /* Move keybindings to window instead of frame */
diff --git a/src/x11/window-x11-private.h b/src/x11/window-x11-private.h
index ccc3182e1..3a7567ad0 100644
--- a/src/x11/window-x11-private.h
+++ b/src/x11/window-x11-private.h
@@ -102,6 +102,9 @@ struct _MetaWindowX11Private
   /* may be NULL! not all windows get decorated */
   MetaFrame *frame;
 
+  /* if non-NULL, the bounds of the window frame */
+  MtkRegion *frame_bounds;
+
   gboolean has_custom_frame_extents;
   MetaSyncCounter sync_counter;