diff --git a/binary-tiling.cpp b/binary-tiling.cpp
index fb5f235b..7c08458d 100644
--- a/binary-tiling.cpp
+++ b/binary-tiling.cpp
@@ -551,7 +551,9 @@ auto bt_config = addHook(hooks_args, 0, [] () {
 bool pseudohept(cell *c) {
   if(DIM == 2)
     return c->type & c->master->distance & 1;
-  else if(among(geometry, gHoroTris, gHoroRec))
+  else if(geometry == gHoroRec)
+    return c->c.spin(S7-1) == 0 && (c->master->distance & 1) && c->comve(S7-1)->c.spin(S7-1) == 0;
+  else if(geometry == gHoroTris)
     return c->c.spin(S7-1) == 0 && (c->master->distance & 1);
   else
     return (c->master->zebraval == 1) && (c->master->distance & 1);