diff --git a/code/game/machinery/alarm.dm b/code/game/machinery/alarm.dm
index ea2456cf977..300d62745c0 100644
--- a/code/game/machinery/alarm.dm
+++ b/code/game/machinery/alarm.dm
@@ -181,7 +181,8 @@
 		if(target_temperature < T0C + MIN_TEMPERATURE)
 			target_temperature = T0C + MIN_TEMPERATURE
 
-		var/datum/gas_mixture/gas = location.remove_air(0.25*environment.total_moles)
+		var/datum/gas_mixture/gas
+		gas = location.remove_air(0.25*environment.total_moles)
 		var/heat_capacity = gas.heat_capacity()
 		var/energy_used = max( abs( heat_capacity*(gas.temperature - target_temperature) ), MAX_ENERGY_CHANGE)