diff --git a/help.cpp b/help.cpp
index 509caca9..5bf1f953 100644
--- a/help.cpp
+++ b/help.cpp
@@ -1030,7 +1030,7 @@ EX void describeMouseover() {
       }
     #endif
       
-    if(c->wall && !(c->wall == waChasm && c->land == laDual && ctof(c)) &&
+    if(c->wall && !(c->land == laDual && pseudohept(c)) &&
       !(c->land == laMemory) &&
       !((c->wall == waFloorA || c->wall == waFloorB) && c->item)) { 
 
diff --git a/passable.cpp b/passable.cpp
index 576f4eda..9345159f 100644
--- a/passable.cpp
+++ b/passable.cpp
@@ -143,6 +143,8 @@ EX bool anti_alchemy(cell *w, cell *from) {
 EX bool passable(cell *w, cell *from, flagtype flags) {
   bool vrevdir = bool(flags&P_VOID);
 
+  if(w->land == laDual && pseudohept(w) && !F(P_BULLET)) return false;
+
   if(from && from != w && nonAdjacent(from, w) && !F(P_IGNORE37 | P_BULLET)) return false;
   
   if((isWateryOrBoat(w) || w->wall == waShallow) && F(P_WATERCURSE))
@@ -169,7 +171,6 @@ EX bool passable(cell *w, cell *from, flagtype flags) {
     if(airdist(w) < 3) return false;
     if(againstWind(w,from)) return false;
     if(isGravityLand(w)) return false;
-    if(w->wall == waChasm && w->land == laDual) return false;
     }
 
   if(from && strictlyAgainstGravity(w, from, vrevdir, flags)
diff --git a/pcmove.cpp b/pcmove.cpp
index e6c210ca..f8d78f96 100644
--- a/pcmove.cpp
+++ b/pcmove.cpp
@@ -1136,7 +1136,7 @@ void pcmove::tell_why_impassable() {
     if(vmsg(miRESTRICTED, siGRAVITY, c2, moNone))
       addMessage(XLAT("Gravity does not allow this!"));
     }
-  else if(c2->wall == waChasm && c2->land == laDual) {
+  else if(c2->land == laDual && pseudohept(c2)) {
     if(vmsg(miRESTRICTED, siWALL, c2, moNone))
       addMessage(XLAT("You cannot move there!"));
     }