diff --git a/source/core/maphack.cpp b/source/core/maphack.cpp
index b5b2058a9..278678820 100644
--- a/source/core/maphack.cpp
+++ b/source/core/maphack.cpp
@@ -190,6 +190,10 @@ static int32_t LoadMapHack(const char *filename, SpawnSpriteDef& sprites)
 				hw_SetSplitSector(currentsector, start, end);
 			}
 		}
+		else if (sc.Compare("dontclip"))
+		{
+			sector[currentsector].exflags |= SECTOREX_DONTCLIP;
+		}
 		else if (sc.Compare("clearflags"))
 		{
 			if (currentsector != -1 && validateSector())
diff --git a/source/core/maploader.cpp b/source/core/maploader.cpp
index 8f2a30d6b..da36008e6 100644
--- a/source/core/maploader.cpp
+++ b/source/core/maploader.cpp
@@ -787,7 +787,6 @@ void setWallSectors()
 	for(auto& sect: sector)
 	{
 		sect.dirty = EDirty::AllDirty;
-		sect.exflags = 0;
 		for (auto& wal : wallsofsector(&sect))
 		{
 			if (wal.sector == -1)
diff --git a/source/core/maptypes.h b/source/core/maptypes.h
index ecf37d288..2d4b8d81d 100644
--- a/source/core/maptypes.h
+++ b/source/core/maptypes.h
@@ -94,6 +94,7 @@ enum ESectorExBits
 {
 	SECTOREX_CLOUDSCROLL			= 1,
 	SECTOREX_DRAGGED				= 2,
+	SECTOREX_DONTCLIP				= 4,
 };
 
 // Flags for retriangulation
diff --git a/source/core/rendering/scene/hw_bunchdrawer.cpp b/source/core/rendering/scene/hw_bunchdrawer.cpp
index 8557d8c5e..ffe00b25a 100644
--- a/source/core/rendering/scene/hw_bunchdrawer.cpp
+++ b/source/core/rendering/scene/hw_bunchdrawer.cpp
@@ -278,7 +278,7 @@ int BunchDrawer::ClipLine(int aline, bool portal)
 	if (cline->partner == -1 || (wall[line].cstat & CSTAT_WALL_1WAY) || CheckClip(&wall[line], &topclip, &bottomclip))
 	{
 		// one-sided
-		if (!portal && !dontclip)
+		if (!portal && !dontclip && !(sector[sections[section].sector].exflags & SECTOREX_DONTCLIP))
 		{
 			clipper->AddClipRange(startAngle, endAngle);
 			//Printf("\nWall %d from %2.3f - %2.3f (blocking)\n", line, bamang(startAngle).asdeg(), bamang(endAngle).asdeg());
diff --git a/source/core/savegamehelp.cpp b/source/core/savegamehelp.cpp
index 1672bf7f4..9fe573921 100644
--- a/source/core/savegamehelp.cpp
+++ b/source/core/savegamehelp.cpp
@@ -535,7 +535,8 @@ FSerializer &Serialize(FSerializer &arc, const char *key, sectortype &c, sectort
 			("hitag", c.hitag, def->hitag)
 			("extra", c.extra, def->extra)
 			("portalflags", c.portalflags, def->portalflags)
-			("portalnum", c.portalnum, def->portalnum);
+			("portalnum", c.portalnum, def->portalnum)
+			("exflags", c.exflags, def->exflags);
 
 		// Save the extensions only when playing their respective games.
 		if (isDukeLike())
diff --git a/wadsrc/static/engine/compatibility/25d4164814f10cd71d26d52d494c4fb8.mhk b/wadsrc/static/engine/compatibility/25d4164814f10cd71d26d52d494c4fb8.mhk
new file mode 100644
index 000000000..f1999796f
--- /dev/null
+++ b/wadsrc/static/engine/compatibility/25d4164814f10cd71d26d52d494c4fb8.mhk
@@ -0,0 +1,2 @@
+// Wanton Destruction $auto.map - workaround for sector object overlapping with an outer wall.
+sector 152 dontclip