diff --git a/code/modules/mob/living/simple_animal/simple_animal.dm b/code/modules/mob/living/simple_animal/simple_animal.dm
index a04b191264d..e8f55df37e4 100644
--- a/code/modules/mob/living/simple_animal/simple_animal.dm
+++ b/code/modules/mob/living/simple_animal/simple_animal.dm
@@ -172,10 +172,10 @@
 				if(Environment.oxygen > max_oxy)
 					atmos_suitable = 0
 			if(min_tox)
-				if(Environment.plasma < min_tox)
+				if(Environment.toxins < min_tox)
 					atmos_suitable = 0
 			if(max_tox)
-				if(Environment.plasma > max_tox)
+				if(Environment.toxins > max_tox)
 					atmos_suitable = 0
 			if(min_n2)
 				if(Environment.nitrogen < min_n2)