diff --git a/scripts/build_shapes.py b/scripts/build_shapes.py
index dff6313d..cda27963 100644
--- a/scripts/build_shapes.py
+++ b/scripts/build_shapes.py
@@ -129,6 +129,8 @@ def countries(naturalearth, country_list):
     s = df.set_index("name")["geometry"].map(_simplify_polys)
     if "RS" in country_list:
         s["RS"] = s["RS"].union(s.pop("KV"))
+        # cleanup shape union
+        s["RS"] = Polygon(s["RS"].exterior.coords)
 
     return s