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-rw-r--r--crawl-ref/source/monplace.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/crawl-ref/source/monplace.cc b/crawl-ref/source/monplace.cc
index 5ea9a3b5d7..9dfeb99694 100644
--- a/crawl-ref/source/monplace.cc
+++ b/crawl-ref/source/monplace.cc
@@ -158,6 +158,9 @@ bool monster_habitable_grid(int monster_class,
// Returns true if the monster can submerge in the given grid.
bool monster_can_submerge(const monsters *mons, dungeon_feature_type grid)
{
+ if (mons->type == MONS_TRAPDOOR_SPIDER && grid == DNGN_FLOOR)
+ return true;
+
// Zombies of watery critters can not submerge.
switch (mons_habitat(mons))
{