diff --git a/code/modules/unit_tests/reactions.dm b/code/modules/unit_tests/reactions.dm
index 66d9b49099..c2b62f6fdc 100644
--- a/code/modules/unit_tests/reactions.dm
+++ b/code/modules/unit_tests/reactions.dm
@@ -1,6 +1,7 @@
 /datum/unit_test/reactions/Run()
 	for(var/datum/gas_reaction/G in SSair.gas_reactions)
-		var/test_info = G.test()
-		if(!test_info["success"])
-			var/message = test_info["message"]
-			Fail("Gas reaction [G.name] is failing its unit test with the following message: [message]")
+		if(!G.exclude)
+			var/test_info = G.test()
+			if(!test_info["success"])
+				var/message = test_info["message"]
+				Fail("Gas reaction [G.name] is failing its unit test with the following message: [message]")