diff --git a/code/datums/gas_mixture.dm b/code/datums/gas_mixture.dm
index 35cc970aa67..63b70b512ee 100644
--- a/code/datums/gas_mixture.dm
+++ b/code/datums/gas_mixture.dm
@@ -645,7 +645,7 @@ What are the archived variables for?
 		((nitrogen < (1-MINIMUM_AIR_RATIO_TO_SUSPEND)*sample.nitrogen) || (nitrogen > (1+MINIMUM_AIR_RATIO_TO_SUSPEND)*sample.nitrogen)))
 		return 0
 	if((abs(carbon_dioxide-sample.carbon_dioxide) > MINIMUM_AIR_TO_SUSPEND) && \
-		((carbon_dioxide < (1-MINIMUM_AIR_RATIO_TO_SUSPEND)*sample.carbon_dioxide) || (oxygen > (1+MINIMUM_AIR_RATIO_TO_SUSPEND)*sample.carbon_dioxide)))
+		((carbon_dioxide < (1-MINIMUM_AIR_RATIO_TO_SUSPEND)*sample.carbon_dioxide) || (carbon_dioxide > (1+MINIMUM_AIR_RATIO_TO_SUSPEND)*sample.carbon_dioxide)))
 		return 0
 	if((abs(toxins-sample.toxins) > MINIMUM_AIR_TO_SUSPEND) && \
 		((toxins < (1-MINIMUM_AIR_RATIO_TO_SUSPEND)*sample.toxins) || (toxins > (1+MINIMUM_AIR_RATIO_TO_SUSPEND)*sample.toxins)))