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-rw-r--r--crawl-ref/source/mtransit.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/crawl-ref/source/mtransit.h b/crawl-ref/source/mtransit.h
index 3ffc0adfc8..b4f4d48f26 100644
--- a/crawl-ref/source/mtransit.h
+++ b/crawl-ref/source/mtransit.h
@@ -31,7 +31,7 @@ typedef std::map<level_id, m_transit_list> monsters_in_transit;
extern monsters_in_transit the_lost_ones;
-void add_monster_to_transit(level_id dest, const monsters &m);
+void add_monster_to_transit(const level_id &dest, const monsters &m);
// Places (some of the) monsters eligible to be placed on this level.
void place_transiting_monsters();