diff --git a/data-otservbr-global/scripts/lib/monster_functions.lua b/data-otservbr-global/scripts/lib/monster_functions.lua
index cdb56c5e177..0b362de27a9 100644
--- a/data-otservbr-global/scripts/lib/monster_functions.lua
+++ b/data-otservbr-global/scripts/lib/monster_functions.lua
@@ -1,7 +1,7 @@
 function Monster:handleCobraOnSpawn()
 	if Game.getStorageValue(Global.Storage.CobraFlask) >= os.time() then
-		monster:setHealth(monster:getMaxHealth() * 0.75)
-		monster:getPosition():sendMagicEffect(CONST_ME_GREEN_RINGS)
+		self:setHealth(self:getMaxHealth() * 0.75)
+		self:getPosition():sendMagicEffect(CONST_ME_GREEN_RINGS)
 	else
 		Game.setStorageValue(Global.Storage.CobraFlask, -1)
 	end