diff --git a/bigstuff.cpp b/bigstuff.cpp
index 70c8e8ee..7d20e5f3 100644
--- a/bigstuff.cpp
+++ b/bigstuff.cpp
@@ -1362,6 +1362,9 @@ void moreBigStuff(cell *c) {
           forCellCM(c2, c) if(celldistAlt(c2) < celldistAlt(c)) i++;
           if(i > 1) c->wall = waColumn;
           }
+        else if(geometry == gHoroTris) {
+          if(c->c.spin(S7-1) != 0) c->wall = waColumn;
+          }
         else if(DIM == 3) {
           if(c->master->zebraval != 1) c->wall = waColumn;
           }
diff --git a/binary-tiling.cpp b/binary-tiling.cpp
index f5309366..a9964ed2 100644
--- a/binary-tiling.cpp
+++ b/binary-tiling.cpp
@@ -439,6 +439,8 @@ auto bt_config = addHook(hooks_args, 0, [] () {
 bool pseudohept(cell *c) {
   if(DIM == 2)
     return c->type & c->master->distance & 1;
+  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);
   }