diff --git a/code/modules/mob/living/living_verbs.dm b/code/modules/mob/living/living_verbs.dm
index 3f5f5403818a..1d51e43fd71d 100644
--- a/code/modules/mob/living/living_verbs.dm
+++ b/code/modules/mob/living/living_verbs.dm
@@ -173,7 +173,7 @@
 	if(mobility_flags & MOBILITY_MOVE)
 		if(on_fire)
 			resist_fire()
-		if(is_type_in_list(/datum/effects/acid, effects_list))
+		if(locate(/datum/effects/acid) in effects_list)
 			resist_acid()
 		if(last_special <= world.time)
 			resist_restraints()