diff --git a/Source/monster.cpp b/Source/monster.cpp
index bf1ba0479..c643eb470 100644
--- a/Source/monster.cpp
+++ b/Source/monster.cpp
@@ -1378,7 +1378,11 @@ void M_StartWalk3(int i, int xvel, int yvel, int xoff, int yoff, int xadd, int y
 	int x = mapx + monster[i]._mx;
 	int y = mapy + monster[i]._my;
 
+#ifdef HELLFIRE
+	if (!(monster[i]._mFlags & MFLAG_HIDDEN) && monster[i].mlid != 0)
+#else
 	if (monster[i]._uniqtype != 0)
+#endif
 		ChangeLightXY(monster[i].mlid, x, y);
 
 	dMonster[monster[i]._mx][monster[i]._my] = -(i + 1);