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-rw-r--r--core/dive.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/core/dive.c b/core/dive.c
index 54d2a00f4..6d19b7e58 100644
--- a/core/dive.c
+++ b/core/dive.c
@@ -1184,7 +1184,7 @@ bool isobaric_counterdiffusion(struct gasmix *oldgasmix, struct gasmix *newgasmi
{
results->dN2 = get_he(oldgasmix) + get_o2(oldgasmix) - get_he(newgasmix) - get_o2(newgasmix);
results->dHe = get_he(newgasmix) - get_he(oldgasmix);
- return get_he(oldgasmix) && results->dN2 > 0 && 5 * results->dN2 > -results->dHe;
+ return get_he(oldgasmix) > 0 && results->dN2 > 0 && results->dHe < 0 && get_he(oldgasmix) && results->dN2 > 0 && 5 * results->dN2 > -results->dHe;
}
/* some events should never be thrown away */