diff --git a/code/modules/atmospherics/machinery/airalarm.dm b/code/modules/atmospherics/machinery/airalarm.dm
index f924a3bc0a..5ea4be80cb 100644
--- a/code/modules/atmospherics/machinery/airalarm.dm
+++ b/code/modules/atmospherics/machinery/airalarm.dm
@@ -554,6 +554,7 @@
 						GAS_MIASMA,
 						GAS_PLASMA,
 						GAS_H2O,
+						GAS_HYDROGEN,
 						GAS_HYPERNOB,
 						GAS_NITROUS,
 						GAS_NITRYL,