diff --git a/code/modules/clothing/masks/miscellaneous.dm b/code/modules/clothing/masks/miscellaneous.dm
index 92d17eaa0a..fc4185f207 100644
--- a/code/modules/clothing/masks/miscellaneous.dm
+++ b/code/modules/clothing/masks/miscellaneous.dm
@@ -40,6 +40,7 @@
 	flags_cover = null
 	visor_flags_inv = null
 	visor_flags_cover = null
+	permeability_coefficient = 1
 	armor = list("melee" = 0, "bullet" = 0, "laser" = 0,"energy" = 0, "bomb" = 0, "bio" = 0, "rad" = 0, "fire" = 0, "acid" = 0)
 
 /obj/item/clothing/mask/surgical/attack_self(mob/user)