diff --git a/code/modules/atmospherics/gasmixtures/gas_mixture.dm b/code/modules/atmospherics/gasmixtures/gas_mixture.dm
index a9ca6359ac..d7fb2e8b5a 100644
--- a/code/modules/atmospherics/gasmixtures/gas_mixture.dm
+++ b/code/modules/atmospherics/gasmixtures/gas_mixture.dm
@@ -280,7 +280,7 @@ we use a hook instead
 	parse_gas_string(model.initial_gas_mix)
 	return 1
 
-/datum/gas_mixture/proc/__auxtools_parse_gas_string
+/datum/gas_mixture/proc/__auxtools_parse_gas_string(gas_string)
 
 /datum/gas_mixture/parse_gas_string(gas_string)
 	return __auxtools_parse_gas_string(gas_string)