diff --git a/source/duke3d/src/gamevars.cpp b/source/duke3d/src/gamevars.cpp
index 9ef7f8e54..4e4df38d7 100644
--- a/source/duke3d/src/gamevars.cpp
+++ b/source/duke3d/src/gamevars.cpp
@@ -1586,6 +1586,7 @@ static void Gv_AddSystemVars(void)
     Gv_NewArray("tilesizx", (void *)&tilesiz[0].x, MAXTILES, GAMEARRAY_SYSTEM|GAMEARRAY_STRIDE2|GAMEARRAY_READONLY|GAMEARRAY_INT16);
     Gv_NewArray("tilesizy", (void *)&tilesiz[0].y, MAXTILES, GAMEARRAY_SYSTEM|GAMEARRAY_STRIDE2|GAMEARRAY_READONLY|GAMEARRAY_INT16);
     Gv_NewArray("gotpic", (void *) &gotpic[0], MAXTILES, GAMEARRAY_SYSTEM|GAMEARRAY_BITMAP);
+    Gv_NewArray("show2dsector", (void *) &show2dsector[0], MAXSECTORS, GAMEARRAY_SYSTEM|GAMEARRAY_BITMAP);
 #endif
 }