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-rw-r--r--core/gas.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/core/gas.h b/core/gas.h
index 5e0f4675f..cd7c9e389 100644
--- a/core/gas.h
+++ b/core/gas.h
@@ -69,6 +69,7 @@ extern fraction_t get_gas_component_fraction(struct gasmix mix, enum gas_compone
extern void fill_pressures(struct gas_pressures *pressures, double amb_pressure, struct gasmix mix, double po2, enum divemode_t dctype);
extern bool gasmix_is_air(struct gasmix gasmix);
+extern bool gasmix_is_invalid(struct gasmix mix);
extern enum gastype gasmix_to_type(struct gasmix mix);
extern const char *gastype_name(enum gastype type);