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-rw-r--r--crawl-ref/source/dgn-swamp.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/crawl-ref/source/dgn-swamp.cc b/crawl-ref/source/dgn-swamp.cc
index b20627e2d3..de71736312 100644
--- a/crawl-ref/source/dgn-swamp.cc
+++ b/crawl-ref/source/dgn-swamp.cc
@@ -63,6 +63,7 @@ void dgn_build_swamp_level(int level)
_swamp_slushy_patches(swamp_depth * 3);
dgn_smooth_heights();
_swamp_apply_features(2);
+ env.heightmap.reset(NULL);
dgn_place_stone_stairs();
process_disconnected_zones(0, 0, GXM - 1, GYM - 1, true, DNGN_TREES);