diff --git a/mtk/mtk/mtk-region.c b/mtk/mtk/mtk-region.c
index d132ead3d..78651efea 100644
--- a/mtk/mtk/mtk-region.c
+++ b/mtk/mtk/mtk-region.c
@@ -435,3 +435,36 @@ mtk_region_crop_and_scale (MtkRegion       *region,
 
   return viewport_region;
 }
+
+MtkRegion *
+mtk_region_apply_matrix_transform_expand (const MtkRegion   *region,
+                                          graphene_matrix_t *transform)
+{
+  MtkRegion *transformed_region;
+  MtkRectangle *rects;
+  int n_rects, i;
+
+  if (graphene_matrix_is_identity (transform))
+    return mtk_region_copy (region);
+
+  n_rects = mtk_region_num_rectangles (region);
+  MTK_RECTANGLE_CREATE_ARRAY_SCOPED (n_rects, rects);
+  for (i = 0; i < n_rects; i++)
+    {
+      graphene_rect_t transformed_rect, rect;
+      MtkRectangle int_rect;
+
+      int_rect = mtk_region_get_rectangle (region, i);
+      rect = mtk_rectangle_to_graphene_rect (&int_rect);
+
+      graphene_matrix_transform_bounds (transform, &rect, &transformed_rect);
+
+      mtk_rectangle_from_graphene_rect (&transformed_rect,
+                                        MTK_ROUNDING_STRATEGY_GROW,
+                                        &rects[i]);
+    }
+
+  transformed_region = mtk_region_create_rectangles (rects, n_rects);
+
+  return transformed_region;
+}
diff --git a/mtk/mtk/mtk-region.h b/mtk/mtk/mtk-region.h
index f4f6dcfec..831a583bd 100644
--- a/mtk/mtk/mtk-region.h
+++ b/mtk/mtk/mtk-region.h
@@ -124,4 +124,8 @@ MtkRegion * mtk_region_crop_and_scale (MtkRegion       *region,
                                        int              dst_width,
                                        int              dst_height);
 
+MTK_EXPORT
+MtkRegion * mtk_region_apply_matrix_transform_expand (const MtkRegion   *region,
+                                                      graphene_matrix_t *transform);
+
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (MtkRegion, mtk_region_unref)
diff --git a/src/compositor/meta-cullable.c b/src/compositor/meta-cullable.c
index 7279f4ff3..7b6cd2b68 100644
--- a/src/compositor/meta-cullable.c
+++ b/src/compositor/meta-cullable.c
@@ -53,7 +53,7 @@ region_apply_transform_expand_maybe_ref (MtkRegion         *region,
   if (mtk_region_is_empty (region))
     return mtk_region_ref (region);
 
-  return meta_region_apply_matrix_transform_expand (region, transform);
+  return mtk_region_apply_matrix_transform_expand (region, transform);
 }
 
 /**
diff --git a/src/compositor/meta-surface-actor.c b/src/compositor/meta-surface-actor.c
index c5d75fa45..1c10b850f 100644
--- a/src/compositor/meta-surface-actor.c
+++ b/src/compositor/meta-surface-actor.c
@@ -492,7 +492,7 @@ meta_surface_actor_is_obscured_on_stage_view (MetaSurfaceActor *self,
                                                         stage,
                                                         &transform);
 
-      intersection_region = meta_region_apply_matrix_transform_expand (unobscured_region, &transform);
+      intersection_region = mtk_region_apply_matrix_transform_expand (unobscured_region, &transform);
 
       clutter_stage_view_get_layout (stage_view, &stage_rect);
       mtk_region_intersect_rectangle (intersection_region,
diff --git a/src/compositor/meta-window-group.c b/src/compositor/meta-window-group.c
index bb59264c5..b88648f54 100644
--- a/src/compositor/meta-window-group.c
+++ b/src/compositor/meta-window-group.c
@@ -120,8 +120,8 @@ meta_window_group_paint (ClutterActor        *actor,
    * multihead setup with mismatched monitor sizes, we could intersect this
    * with an accurate union of the monitors to avoid painting shadows that are
    * visible only in the holes. */
-  clip_region = meta_region_apply_matrix_transform_expand (redraw_clip,
-                                                           &stage_to_actor);
+  clip_region = mtk_region_apply_matrix_transform_expand (redraw_clip,
+                                                          &stage_to_actor);
 
   meta_cullable_cull_redraw_clip (META_CULLABLE (window_group), clip_region);
 
diff --git a/src/compositor/region-utils.c b/src/compositor/region-utils.c
index 981e843c8..c5bf39c97 100644
--- a/src/compositor/region-utils.c
+++ b/src/compositor/region-utils.c
@@ -343,36 +343,3 @@ meta_region_transform (const MtkRegion      *region,
 
   return transformed_region;
 }
-
-MtkRegion *
-meta_region_apply_matrix_transform_expand (const MtkRegion   *region,
-                                           graphene_matrix_t *transform)
-{
-  int n_rects, i;
-  MtkRectangle *rects;
-  MtkRegion *transformed_region;
-
-  if (graphene_matrix_is_identity (transform))
-    return mtk_region_copy (region);
-
-  n_rects = mtk_region_num_rectangles (region);
-  MTK_RECTANGLE_CREATE_ARRAY_SCOPED (n_rects, rects);
-  for (i = 0; i < n_rects; i++)
-    {
-      graphene_rect_t transformed_rect, rect;
-      MtkRectangle int_rect;
-
-      int_rect = mtk_region_get_rectangle (region, i);
-      rect = mtk_rectangle_to_graphene_rect (&int_rect);
-
-      graphene_matrix_transform_bounds (transform, &rect, &transformed_rect);
-
-      mtk_rectangle_from_graphene_rect (&transformed_rect,
-                                        MTK_ROUNDING_STRATEGY_GROW,
-                                        &rects[i]);
-    }
-
-  transformed_region = mtk_region_create_rectangles (rects, n_rects);
-
-  return transformed_region;
-}
diff --git a/src/compositor/region-utils.h b/src/compositor/region-utils.h
index 7613aa9ec..c62192ffa 100644
--- a/src/compositor/region-utils.h
+++ b/src/compositor/region-utils.h
@@ -101,7 +101,3 @@ MtkRegion * meta_region_transform (const MtkRegion      *region,
                                    MetaMonitorTransform  transform,
                                    int                   width,
                                    int                   height);
-
-MtkRegion *
-meta_region_apply_matrix_transform_expand (const MtkRegion   *region,
-                                           graphene_matrix_t *transform);