diff --git a/src/main/java/electroblob/wizardry/spell/MarkSacrifice.java b/src/main/java/electroblob/wizardry/spell/MarkSacrifice.java
index 5098096b..cd026485 100644
--- a/src/main/java/electroblob/wizardry/spell/MarkSacrifice.java
+++ b/src/main/java/electroblob/wizardry/spell/MarkSacrifice.java
@@ -63,7 +63,7 @@ public class MarkSacrifice extends SpellRay {
 		PotionEffect effect = event.getEntityLiving().getActivePotionEffect(WizardryPotions.mark_of_sacrifice);
 
 		if(effect != null && event.getSource().isMagicDamage()){
-			event.setAmount(event.getAmount() * (1 + effect.getAmplifier()) * DAMAGE_INCREASE_PER_LEVEL);
+			event.setAmount(event.getAmount() * (1 + (1 + effect.getAmplifier()) * DAMAGE_INCREASE_PER_LEVEL));
 			event.getEntityLiving().removePotionEffect(WizardryPotions.mark_of_sacrifice);
 		}
 	}