diff --git a/code/datums/atmosphere/planetary.dm b/code/datums/atmosphere/planetary.dm
index 8089a9a7d1..f1d2e85755 100644
--- a/code/datums/atmosphere/planetary.dm
+++ b/code/datums/atmosphere/planetary.dm
@@ -25,7 +25,6 @@
 
 /datum/atmosphere/lavaland/check_for_sanity(datum/gas_mixture/mix)
 	var/datum/breathing_class/o2_class = GLOB.gas_data.breathing_classes[BREATH_OXY]
-	var/initial_co2_quantity = mix.get_moles(GAS_CO2)
 	while(o2_class.get_effective_pp(mix) < 10)
 		mix.adjust_moles(GAS_CO2, -0.5)
 		mix.adjust_moles(GAS_O2, 0.5)