diff --git a/code/modules/vehicles/mecha/equipment/tools/air_tank.dm b/code/modules/vehicles/mecha/equipment/tools/air_tank.dm
index f00444ae598..6d9765e6b05 100644
--- a/code/modules/vehicles/mecha/equipment/tools/air_tank.dm
+++ b/code/modules/vehicles/mecha/equipment/tools/air_tank.dm
@@ -79,11 +79,10 @@
 	var/datum/gas_mixture/tank_air = internal_tank.return_air()
 	var/datum/gas_mixture/cabin_air = chassis.cabin_air
 	var/release_pressure = internal_tank.release_pressure
-	var/cabin_pressure = cabin_air.return_pressure()
-	if(cabin_pressure < release_pressure)
+	if(cabin_air.return_pressure() < release_pressure)
 		tank_air.release_gas_to(cabin_air, release_pressure)
-	if(cabin_pressure)
-		cabin_air.pump_gas_to(external_air, PUMP_MAX_PRESSURE, GAS_CO2)
+	if(cabin_air.has_gas(/datum/gas/carbon_dioxide))
+		cabin_air.pump_gas_to(external_air, PUMP_MAX_PRESSURE, /datum/gas/carbon_dioxide)
 
 /obj/item/mecha_parts/mecha_equipment/air_tank/proc/process_pump(seconds_per_tick)
 	if(!tank_pump_active)