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-rw-r--r--divelist.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/divelist.c b/divelist.c
index ba11f02c1..f1dd7006c 100644
--- a/divelist.c
+++ b/divelist.c
@@ -134,7 +134,8 @@ void get_dive_gas(struct dive *dive, int *o2_p, int *he_p, int *o2max_p)
mino2 = o2;
}
/* All air? Show/sort as "air"/zero */
- if (!maxhe && maxo2 == O2_IN_AIR && mino2 == maxo2)
+ if ((!maxhe && maxo2 == O2_IN_AIR && mino2 == maxo2) ||
+ (maxo2 == -1 && maxhe == -1 && mino2 == 1000))
maxo2 = mino2 = 0;
*o2_p = mino2;
*he_p = maxhe;