diff --git a/c/xlib/region.c b/c/xlib/region.c
index dc5974e..4076c84 100644
--- a/c/xlib/region.c
+++ b/c/xlib/region.c
@@ -164,5 +164,6 @@ void scx_init_region(void) {
   S48_EXPORT_FUNCTION(scx_Shrink_Region);
   S48_EXPORT_FUNCTION(scx_Polygon_Region);
   S48_EXPORT_FUNCTION(scx_Set_Region);
+  S48_EXPORT_FUNCTION(scx_Copy_Region);
 }