diff --git a/code/modules/surgery/organs/lungs.dm b/code/modules/surgery/organs/lungs.dm
index 56aa715190..1e22796b1b 100644
--- a/code/modules/surgery/organs/lungs.dm
+++ b/code/modules/surgery/organs/lungs.dm
@@ -400,6 +400,7 @@
 	icon_state = "lungs-plasma"
 
 	safe_oxygen_min = 0 //We don't breath this
+	safe_oxygen_max = 0 // Like, at all.
 	safe_toxins_min = 16 //We breath THIS!
 	safe_toxins_max = 0