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-rw-r--r--crawl-ref/source/dungeon.cc4
1 files changed, 3 insertions, 1 deletions
diff --git a/crawl-ref/source/dungeon.cc b/crawl-ref/source/dungeon.cc
index 91768a1fee..e997931c82 100644
--- a/crawl-ref/source/dungeon.cc
+++ b/crawl-ref/source/dungeon.cc
@@ -379,7 +379,9 @@ static void dgn_map_colour_fixup()
for (int y = Y_BOUND_1; y <= Y_BOUND_2; ++y)
for (int x = X_BOUND_1; x <= X_BOUND_2; ++x)
if (dcgrid[x][y].colour != BLACK
- && grd[x][y] != dcgrid[x][y].feature)
+ && grd[x][y] != dcgrid[x][y].feature
+ && (grd[x][y] != DNGN_UNDISCOVERED_TRAP
+ || dcgrid[x][y].feature != DNGN_FLOOR))
{
env.grid_colours[x][y] = BLACK;
}