diff --git a/gdk/x11/gdkprivate-x11.h b/gdk/x11/gdkprivate-x11.h
index 0f8ca87765..69a1248b8a 100644
--- a/gdk/x11/gdkprivate-x11.h
+++ b/gdk/x11/gdkprivate-x11.h
@@ -230,6 +230,12 @@ GdkDrag        * _gdk_x11_surface_drag_begin (GdkSurface          *window,
                                               gint                dx,
                                               gint                dy);
 
+void gdk_x11_surface_get_root_coords (GdkSurface *surface,
+                                      gint        x,
+                                      gint        y,
+                                      gint       *root_x,
+                                      gint       *root_y);
+
 GdkGrabStatus _gdk_x11_convert_grab_status (gint status);
 
 cairo_surface_t * _gdk_x11_display_create_bitmap_surface (GdkDisplay *display,
diff --git a/gdk/x11/gdksurface-x11.c b/gdk/x11/gdksurface-x11.c
index 7c4ce1199e..8d052e9d3d 100644
--- a/gdk/x11/gdksurface-x11.c
+++ b/gdk/x11/gdksurface-x11.c
@@ -2402,7 +2402,7 @@ gdk_x11_surface_get_geometry (GdkSurface *surface,
     }
 }
 
-static void
+void
 gdk_x11_surface_get_root_coords (GdkSurface *surface,
 				gint       x,
 				gint       y,