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-rw-r--r--src/sound.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/sound.cpp b/src/sound.cpp
index 960794bbd..9fed4a689 100644
--- a/src/sound.cpp
+++ b/src/sound.cpp
@@ -241,7 +241,8 @@ void SndPlayTileFx(SoundFx sound, TileIndex tile)
/* emits sound from center of the tile */
int x = TileX(tile) * TILE_SIZE + TILE_SIZE / 2;
int y = TileY(tile) * TILE_SIZE - TILE_SIZE / 2;
- Point pt = RemapCoords(x, y, GetSlopeZ(x, y));
+ uint z = (y < 0 ? 0 : GetSlopeZ(x, y));
+ Point pt = RemapCoords(x, y, z);
y += 2 * TILE_SIZE;
Point pt2 = RemapCoords(x, y, GetSlopeZ(x, y));
SndPlayScreenCoordFx(sound, pt.x, pt2.x, pt.y, pt2.y);