diff --git a/code/modules/atmospherics/auxgm/breathing_classes.dm b/code/modules/atmospherics/auxgm/breathing_classes.dm
index 6b1f155603..51a8e7bd40 100644
--- a/code/modules/atmospherics/auxgm/breathing_classes.dm
+++ b/code/modules/atmospherics/auxgm/breathing_classes.dm
@@ -45,7 +45,7 @@
 /datum/breathing_class/methane
 	gases = list(
 		GAS_METHANE = 1,
-		GAS_METHYL_BROMIDE = -0.7
+		GAS_METHYL_BROMIDE = -0.7,
 		GAS_OXYGEN = -0.1,
 		GAS_PLUOXIUM = -0.8
 	)