diff --git a/game.cpp b/game.cpp
index 92934b8c..9af11a48 100644
--- a/game.cpp
+++ b/game.cpp
@@ -851,13 +851,13 @@ bool passable_for(eMonster m, cell *w, cell *from, flagtype extra) {
     if(extra & P_ONPLAYER) {
       if(isPlayerOn(w)) return true;
       }
-    return !ctof(w) && passable(w, from, extra);
+    return !pseudohept(w) && passable(w, from, extra);
     }
   if(m == moAltDemon) {
     if(extra & P_ONPLAYER) {
       if(isPlayerOn(w)) return true;
       }
-    return (!w || !from || w==from || ctof(w) || ctof(from)) && passable(w, from, extra);
+    return (!w || !from || w==from || pseudohept(w) || pseudohept(from)) && passable(w, from, extra);
     }
   if(m == moMonk) {
     if(extra & P_ONPLAYER) {
diff --git a/landgen.cpp b/landgen.cpp
index 3f4dbbce..d3e6563f 100644
--- a/landgen.cpp
+++ b/landgen.cpp
@@ -97,7 +97,7 @@ bool out_ruin(cell *c) {
 
 eMonster genRuinMonster(cell *c) {
   eMonster m = pick(moHexDemon, moHexDemon, moHexDemon, moAltDemon, moAltDemon, moMonk, moMonk, moSkeleton, moSkeleton, moCrusher);
-  if(m == moHexDemon && ctof(c))
+  if(m == moHexDemon && pseudohept(c))
     return genRuinMonster(c);
   if(m == moMonk) {
     if(c->item) return genRuinMonster(c);