diff --git a/src/external/rlsw.h b/src/external/rlsw.h
index da2c6d93e..02bea76de 100644
--- a/src/external/rlsw.h
+++ b/src/external/rlsw.h
@@ -79,7 +79,7 @@
 #endif
 
 #ifndef SW_MAX_CLIPPED_POLYGON_VERTICES
-#   define SW_MAX_CLIPPED_POLYGON_VERTICES 12
+#   define SW_MAX_CLIPPED_POLYGON_VERTICES 24
 #endif
 
 #ifndef SW_CLIP_EPSILON