diff --git a/src/backends/native/meta-crtc-kms.h b/src/backends/native/meta-crtc-kms.h
index 3d024123c..f04a6f15a 100644
--- a/src/backends/native/meta-crtc-kms.h
+++ b/src/backends/native/meta-crtc-kms.h
@@ -44,9 +44,6 @@ MetaKmsPlane * meta_crtc_kms_get_assigned_cursor_plane (MetaCrtcKms *crtc_kms);
 void meta_crtc_kms_set_mode (MetaCrtcKms   *crtc_kms,
                              MetaKmsUpdate *kms_update);
 
-void meta_crtc_kms_set_is_underscanning (MetaCrtcKms *crtc_kms,
-                                         gboolean     is_underscanning);
-
 META_EXPORT_TEST
 MetaKmsCrtc * meta_crtc_kms_get_kms_crtc (MetaCrtcKms *crtc_kms);