diff --git a/Resources/Prototypes/Entities/Effects/puddle.yml b/Resources/Prototypes/Entities/Effects/puddle.yml
index ceb7061d19..a7a28c657e 100644
--- a/Resources/Prototypes/Entities/Effects/puddle.yml
+++ b/Resources/Prototypes/Entities/Effects/puddle.yml
@@ -20,10 +20,9 @@
         !type:PhysShapeAabb
           bounds: "-0.4,-0.4,0.4,0.4"
       layer:
-        - SmallImpassable
+      - SmallImpassable
       mask:
-        - SmallImpassable
-        - MobImpassable
+      - SmallImpassable
       hard: false
 
 - type: entity