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-rw-r--r--crawl-ref/source/view.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/crawl-ref/source/view.cc b/crawl-ref/source/view.cc
index 6f5d464ef4..93d6111ec6 100644
--- a/crawl-ref/source/view.cc
+++ b/crawl-ref/source/view.cc
@@ -821,6 +821,9 @@ void clear_map(bool clear_detected_items, bool clear_detected_monsters)
if (!clear_detected_monsters && is_envmap_detected_mons(p))
continue;
+ if (env.map(p).flags & MAP_MAGIC_MAPPED_FLAG)
+ continue;
+
set_envmap_obj(p, is_terrain_known(p)? grd(p) : DNGN_UNSEEN);
set_envmap_detected_mons(p, false);
set_envmap_detected_item(p, false);