diff --git a/docs/rh-log.txt b/docs/rh-log.txt
index a7ccb3c46..076a85ff9 100644
--- a/docs/rh-log.txt
+++ b/docs/rh-log.txt
@@ -1,4 +1,9 @@
 May 18, 2006
+- Added a check against rw_havelow in the "sky hack" part of R_NewWall().
+  This prevents the front ceiling from being moved up if there has been no
+  texture defined to draw on the wall. This makes various parts of The
+  Darkest Hour render properly again while still allowing the crosses in
+  heroes2.wad and lamasery.wad to render correctly.
 - Added a NULL sector check to P_CheckFakeFloorTrigger() because there was
   a crash report indicating that an actor being pushed up by a moving floor
   had a NULL sector. Since this field should be valid for every actor, the
diff --git a/src/r_segs.cpp b/src/r_segs.cpp
index c4f3d4ac0..f4e21fbf4 100644
--- a/src/r_segs.cpp
+++ b/src/r_segs.cpp
@@ -1247,13 +1247,16 @@ void R_NewWall (bool needlights)
 				memcpy (&walltop[WallSX1], &wallupper[WallSX1], (WallSX2 - WallSX1)*sizeof(walltop[0]));
 				rw_havehigh = false;
 			}
-			else
+			else if (rw_havelow && frontsector->ceilingplane != backsector->ceilingplane)
 			{ // back ceiling is above front ceiling
+				// The check for rw_havelow is not Doom-compliant, but it avoids HoM that
+				// would otherwise occur because there is space made available for this
+				// wall but nothing to draw for it.
 				// Recalculate walltop so that the wall is clipped by the back sector's
 				// ceiling instead of the front sector's ceiling.
 				WallMost (walltop, backsector->ceilingplane);
 			}
-			// Putting sky ceilins on the front and back of a line alters the way unpegged
+			// Putting sky ceilings on the front and back of a line alters the way unpegged
 			// positioning works.
 			rw_frontlowertop = backsector->ceilingtexz;
 		}