diff --git a/code/__DEFINES/atmospherics/machinery/alarm.dm b/code/__DEFINES/atmospherics/machinery/alarm.dm
index 6edd4ef3d2f1..d64ef99f752f 100644
--- a/code/__DEFINES/atmospherics/machinery/alarm.dm
+++ b/code/__DEFINES/atmospherics/machinery/alarm.dm
@@ -32,7 +32,7 @@
 
 #define AIR_ALARM_MAKE_TLV(mindanger, minwarning, maxwarning, maxdanger) list(mindanger, minwarning, maxwarning, maxdanger)
 #define AIR_ALARM_TEST_TLV(val, list) ( \
-	((val < list[AIR_ALARM_TLV_DANGER_LOW]) || (val > list[AIR_ALARM_TLV_DANGER_HIGH]))? \
-	AIR_ALARM_RAISE_DANGER : ((val < list[AIR_ALARM_TLV_WARNING_LOW] || val > list[AIR_ALARM_TLV_WARNING_HIGH])? \
+	((val < list[AIR_ALARM_TLV_DANGER_LOW]) || (val > list[AIR_ALARM_TLV_DANGER_HIGH]+0.001))? \
+	AIR_ALARM_RAISE_DANGER : ((val < list[AIR_ALARM_TLV_WARNING_LOW] || val > list[AIR_ALARM_TLV_WARNING_HIGH]+0.001)? \
 	AIR_ALARM_RAISE_WARNING : AIR_ALARM_RAISE_OKAY) \
 	)