diff --git a/Mage.Server.Plugins/Mage.Player.AI/src/main/java/mage/player/ai/ComputerPlayer.java b/Mage.Server.Plugins/Mage.Player.AI/src/main/java/mage/player/ai/ComputerPlayer.java
index f7e0c0a3aa8..0725a028f66 100644
--- a/Mage.Server.Plugins/Mage.Player.AI/src/main/java/mage/player/ai/ComputerPlayer.java
+++ b/Mage.Server.Plugins/Mage.Player.AI/src/main/java/mage/player/ai/ComputerPlayer.java
@@ -1536,7 +1536,7 @@ public class ComputerPlayer extends PlayerImpl implements Player {
                     if (!unpaid.getMana().includesMana(mana)) {
                         continue ManaAbility;
                     }
-                    colored += CardUtil.overflowInc(colored, mana.countColored());
+                    colored = CardUtil.overflowInc(colored, mana.countColored());
                 }
                 if (colored > 1 && (cost instanceof ColoredManaCost)) {
                     for (Mana netMana : manaAbility.getNetMana(game)) {