diff --git a/landgen.cpp b/landgen.cpp
index 724056d4..a8868c34 100644
--- a/landgen.cpp
+++ b/landgen.cpp
@@ -2926,7 +2926,7 @@ EX void setdist(cell *c, int d, cell *from) {
     color_t col = patterns::generateCanvas(c);
     c->landparam = col;
     c->wall = canvas_default_wall;
-    if(GDIM == 3 && (col & 0x1000000)) c->wall = waWaxWall;
+    if((GDIM == 3 || geom3::flipped) && (col & 0x1000000)) c->wall = waWaxWall;
     }
 
   #if CAP_FIELD