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-rw-r--r--core/dive.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/core/dive.c b/core/dive.c
index 177c91990..6ac70da71 100644
--- a/core/dive.c
+++ b/core/dive.c
@@ -3253,7 +3253,11 @@ depth_t gas_mnd(struct gasmix mix, depth_t end, const struct dive *dive, int rou
int maxambient = prefs.o2narcotic ?
(int)lrint(ppo2n2.mbar / (1 - get_he(mix) / 1000.0))
:
- (int)lrint(ppo2n2.mbar * N2_IN_AIR / get_n2(mix));
+ get_n2(mix) > 0 ?
+ (int)lrint(ppo2n2.mbar * N2_IN_AIR / get_n2(mix))
+ :
+ // Actually: Infinity
+ 1000000;
rounded_depth.mm = (int)lrint(((double)mbar_to_depth(maxambient, dive)) / roundto) * roundto;
return rounded_depth;
}