diff --git a/src/backends/native/meta-kms-update-private.h b/src/backends/native/meta-kms-update-private.h
index ca9f32578..07944be40 100644
--- a/src/backends/native/meta-kms-update-private.h
+++ b/src/backends/native/meta-kms-update-private.h
@@ -184,9 +184,6 @@ GList * meta_kms_update_get_crtc_color_updates (MetaKmsUpdate *update);
 
 MetaKmsCustomPageFlip * meta_kms_update_take_custom_page_flip_func (MetaKmsUpdate *update);
 
-void meta_kms_update_drop_plane_assignment (MetaKmsUpdate *update,
-                                            MetaKmsPlane  *plane);
-
 META_EXPORT_TEST
 GList * meta_kms_update_take_result_listeners (MetaKmsUpdate *update);
 
diff --git a/src/backends/native/meta-kms-update.c b/src/backends/native/meta-kms-update.c
index 7658db0ca..90e417c55 100644
--- a/src/backends/native/meta-kms-update.c
+++ b/src/backends/native/meta-kms-update.c
@@ -244,13 +244,6 @@ drop_plane_assignment (MetaKmsUpdate          *update,
   return FALSE;
 }
 
-void
-meta_kms_update_drop_plane_assignment (MetaKmsUpdate *update,
-                                       MetaKmsPlane  *plane)
-{
-  drop_plane_assignment (update, plane, NULL);
-}
-
 static void
 update_latch_crtc (MetaKmsUpdate *update,
                    MetaKmsCrtc   *crtc)