diff --git a/source/build/src/clip.cpp b/source/build/src/clip.cpp
index df5ea421e..11a4946ac 100644
--- a/source/build/src/clip.cpp
+++ b/source/build/src/clip.cpp
@@ -1081,7 +1081,7 @@ void getzrange(const vec3_t *pos, int16_t sectnum,
             const int32_t cstat = sprite[j].cstat;
             int32_t daz, daz2;
 
-            if (cstat & CSTAT_SPRITE_INVISIBLE) continue;
+            if (cstat & CSTAT_SPRITE_NOFIND) continue;
             if (cstat&dasprclipmask)
             {
                 int32_t clipyou = 0;
diff --git a/source/games/duke/src/actors.cpp b/source/games/duke/src/actors.cpp
index ae7d35b6c..72d9980a0 100644
--- a/source/games/duke/src/actors.cpp
+++ b/source/games/duke/src/actors.cpp
@@ -4956,7 +4956,7 @@ void getglobalz(DDukeActor* actor)
 		else zr = 127;
 
 		auto cc = s->cstat;
-		s->cstat |= CSTAT_SPRITE_INVISIBLE; // don't clip against self. getzrange cannot detect this because it only receives a coordinate.
+		s->cstat |= CSTAT_SPRITE_NOFIND; // don't clip against self. getzrange cannot detect this because it only receives a coordinate.
 		getzrange_ex(s->x, s->y, s->z - (FOURSLEIGHT), s->sectnum, &actor->ceilingz, hz, &actor->floorz, lz, zr, CLIPMASK0);
 		s->cstat = cc;
 
diff --git a/source/games/duke/src/animatesprites_r.cpp b/source/games/duke/src/animatesprites_r.cpp
index 2b0d4be5e..4832c7843 100644
--- a/source/games/duke/src/animatesprites_r.cpp
+++ b/source/games/duke/src/animatesprites_r.cpp
@@ -815,7 +815,7 @@ void animatesprites_r(spritetype* tsprite, int& spritesortcnt, int x, int y, int
 			break;
 		case UFOBEAM:
 		case RRTILE3586:
-		case RRTILE3587:
+		case LADDER:
 			t->cstat |= 32768;
 			s->cstat |= 32768;
 			break;
diff --git a/source/games/duke/src/namelist_r.h b/source/games/duke/src/namelist_r.h
index ecc5e6a5d..8e7674406 100644
--- a/source/games/duke/src/namelist_r.h
+++ b/source/games/duke/src/namelist_r.h
@@ -933,7 +933,7 @@ y(RRTILE3500, 3500)
 x(SLINGBLADE, 3510)
 y(RRTILE3584, 3584)
 y(RRTILE3586, 3586)
-y(RRTILE3587, 3587)
+y(LADDER, 3587)
 y(RRTILE3600, 3600)
 y(RRTILE3631, 3631)
 y(RRTILE3635, 3635)
diff --git a/source/games/duke/src/player_r.cpp b/source/games/duke/src/player_r.cpp
index cc22cf2e3..2a289474e 100644
--- a/source/games/duke/src/player_r.cpp
+++ b/source/games/duke/src/player_r.cpp
@@ -3426,7 +3426,7 @@ void processinput_r(int snum)
 			chz.actor = nullptr;
 			cz = p->truecz;
 		}
-		else if (chz.actor->s->picnum == RRTILE3587)
+		else if (chz.actor->s->picnum == LADDER)
 		{
 			if (!p->stairs)
 			{
@@ -3473,7 +3473,7 @@ void processinput_r(int snum)
 			p->posxv -= bcos(j, 4);
 			p->posyv -= bsin(j, 4);
 		}
-		if (clz.actor->s->picnum == RRTILE3587)
+		if (clz.actor->s->picnum == LADDER)
 		{
 			if (!p->stairs)
 			{