diff --git a/Mage/src/main/java/mage/game/combat/CombatGroup.java b/Mage/src/main/java/mage/game/combat/CombatGroup.java
index 7ad9391ceac..7c5594343c9 100644
--- a/Mage/src/main/java/mage/game/combat/CombatGroup.java
+++ b/Mage/src/main/java/mage/game/combat/CombatGroup.java
@@ -311,7 +311,7 @@ public class CombatGroup implements Serializable, Copyable<CombatGroup> {
                         if (attacker.getAbilities().containsKey(DeathtouchAbility.getInstance().getId())) {
                             lethalDamage = 1;
                         } else {
-                            lethalDamage = blocker.getToughness().getValue() - blocker.getDamage();
+                            lethalDamage = Math.max(blocker.getToughness().getValue() - blocker.getDamage(), 0);
                         }
                         if (lethalDamage >= damage) {
                             if (!oldRuleDamage) {
@@ -483,7 +483,7 @@ public class CombatGroup implements Serializable, Copyable<CombatGroup> {
                     if (blocker.getAbilities().containsKey(DeathtouchAbility.getInstance().getId())) {
                         lethalDamage = 1;
                     } else {
-                        lethalDamage = attacker.getToughness().getValue() - attacker.getDamage();
+                        lethalDamage = Math.max(attacker.getToughness().getValue() - attacker.getDamage(), 0);
                     }
                     if (lethalDamage >= damage) {
                         assigned.put(attackerId, damage);