diff --git a/code/controllers/Processes/air.dm b/code/controllers/Processes/air.dm
index b6c0d1a0fe7..c251b913ce6 100644
--- a/code/controllers/Processes/air.dm
+++ b/code/controllers/Processes/air.dm
@@ -118,4 +118,5 @@ var/global/datum/controller/process/air_system/air_master
 	slmaster = new /obj/effect/overlay()
 	slmaster.icon = 'icons/effects/tile_effects.dmi'
 	slmaster.icon_state = "sleeping_agent"
-	slmaster.layer = FLY_LAYER
\ No newline at end of file
+	slmaster.layer = FLY_LAYER
+	slmaster.mouse_opacity = 0
\ No newline at end of file