diff --git a/sky.cpp b/sky.cpp
index 15375925..28b88e89 100644
--- a/sky.cpp
+++ b/sky.cpp
@@ -73,6 +73,7 @@ void compute_skyvertices(const vector<sky_item>& sky) {
   if(vid.wall_height < 0 && meuclid && geom3::ggclass() == gcNIH) return; /* same */
   if(among(geom3::ggclass(), gcSol, gcSolN)) return;  /* errors */
   if(among(geom3::ggclass(), gcNil)) return;  /* errors sometimes too */
+  if(geom3::hyp_in_solnih()) return;
 
   int sk = get_skybrightness();