diff --git a/cell.cpp b/cell.cpp
index ecdb5334..b70b5157 100644
--- a/cell.cpp
+++ b/cell.cpp
@@ -462,11 +462,6 @@ EX int celldistAlt(cell *c) {
   return mi;
   }
 
-EX int dirfromto(cell *cfrom, cell *cto) {
-  for(int i=0; i<cfrom->type; i++) if(cfrom->move(i) == cto) return i;
-  return -1;
-  }
-
 #if HDR
 static const int RPV_MODULO = 5;
 static const int RPV_RAND = 0;
diff --git a/game.cpp b/game.cpp
index 1e34bfbc..dd9676fb 100644
--- a/game.cpp
+++ b/game.cpp
@@ -835,7 +835,7 @@ bool ghostmove(eMonster m, cell* to, cell* from) {
 
 bool slimepassable(cell *w, cell *c) {
   if(w == c || !c) return true;
-  int u = dirfromto(c, w);
+  int u = neighborId(c, w);
   if(nonAdjacent(w,c)) return false;
   if(isPlayerOn(w)) return true;
   int group = slimegroup(c);
diff --git a/hyper.h b/hyper.h
index 2cd7caef..dca0a54d 100644
--- a/hyper.h
+++ b/hyper.h
@@ -849,8 +849,6 @@ namespace mirror {
   void act(int dir, int flags);
   }
 
-int neighborId(cell *c1, cell *c2);
-
 struct movedir { 
   int d; 
   // non-negative numbers denote 'rotate +d steps and act in this direction
diff --git a/shmup.cpp b/shmup.cpp
index 64a28a48..63ef771e 100644
--- a/shmup.cpp
+++ b/shmup.cpp
@@ -1032,7 +1032,7 @@ void movePlayer(monster *m, int delta) {
           }
         else {
           if(isWatery(m->base)) 
-            m->base->wall = waBoat, m->base->mondir = dirfromto(m->base, c2);
+            m->base->wall = waBoat, m->base->mondir = neighborId(m->base, c2);
           else if(boatStrandable(m->base))
             m->base->wall = waStrandedBoat;
           else if(boatStrandable(c2))
@@ -1041,7 +1041,7 @@ void movePlayer(monster *m, int delta) {
           }
         }
       else if(isPushable(c2->wall) && !nonAdjacent(c2, m->base)) {
-        int sd = dirfromto(c2, m->base);
+        int sd = neighborId(c2, m->base);
         int subdir = 1;
         double bestd = 9999;
         pushmonsters();
@@ -1053,7 +1053,7 @@ void movePlayer(monster *m, int delta) {
           if(d<bestd) bestd=d, subdir = di;
           }
         visibleFor(300);
-        cellwalker push(c2, dirfromto(c2, m->base));
+        cellwalker push(c2, neighborId(c2, m->base));
         push = push + 3 * (-subdir) + wstep;
         if(!canPushThumperOn(push.at, c2, m->base) && c2->type == 7) {
           push = push + wstep - subdir + wstep;
@@ -1109,7 +1109,7 @@ void movePlayer(monster *m, int delta) {
       
       if(items[itOrbDigging]) {
         visibleFor(400);
-        int d = dirfromto(m->base, c2);
+        int d = neighborId(m->base, c2);
         if(d >= 0 && earthMove(m->base, d)) markOrb(itOrbDigging);
         }
       
@@ -2171,7 +2171,7 @@ void moveMonster(monster *m, int delta) {
   if(c2 != m->base && m->type == moFireElemental) makeflame(m->base, 20, false);
   if(c2 != m->base && m->type == moWaterElemental) placeWater(c2, m->base);
   if(c2 != m->base && m->type == moEarthElemental) {
-    int d = dirfromto(m->base, c2);
+    int d = neighborId(m->base, c2);
     if(d >= 0) earthMove(m->base, d);
     }
   
@@ -2194,7 +2194,7 @@ void moveMonster(monster *m, int delta) {
   if(c2 != m->base && m->type == moNecromancer && !c2->monst) {
     for(int i=0; i<m->base->type; i++) {
       cell *c3 = m->base->move(i);
-      if(dirfromto(c3, c2) != -1 && c3->wall == waFreshGrave && gmatrix.count(c3)) {
+      if(neighborId(c3, c2) != -1 && c3->wall == waFreshGrave && gmatrix.count(c3)) {
         bool monstersNear = false;
         for(monster *m2: nonvirtual) {
           if(m2 != m && intval(m2->pat*C0, gmatrix[c3]*C0) < SCALE2 * .3)
@@ -2251,7 +2251,7 @@ void moveMonster(monster *m, int delta) {
         }
       if(passable_for(m->type, c2, m->base, P_CHAIN | P_ONPLAYER | reflectflag) && !isWatery(c2) && m->inBoat) {
         if(isWatery(m->base)) 
-          m->base->wall = waBoat, m->base->mondir = dirfromto(m->base, c2);
+          m->base->wall = waBoat, m->base->mondir = neighborId(m->base, c2);
         else if(boatStrandable(c2)) c2->wall = waStrandedBoat;
         else if(boatStrandable(m->base)) m->base->wall = waStrandedBoat;
         m->inBoat = false;