diff --git a/changelog.md b/changelog.md
index c47bab7..f197149 100644
--- a/changelog.md
+++ b/changelog.md
@@ -12,6 +12,7 @@ These changes will (most likely) be included in the next version.
 
 ## [Unreleased]
 - MobArena no longer touches the `flySpeed` player attribute when players join an arena. This should fix issues where a crash would result in players being "locked in the air" when trying to fly outside of the arena. It also introduces compatibility with plugins that use flight to augment player abilities.
+- Fixed a bug introduced by a breaking API change in Spigot where a player with a nearly full inventory might cause item rewards to change stack amounts.
 
 ## [0.103.1] - 2018-12-31
 - Like the other user commands, the permission for `/ma ready` now defaults to true. 
diff --git a/src/main/java/com/garbagemule/MobArena/things/ItemStackThing.java b/src/main/java/com/garbagemule/MobArena/things/ItemStackThing.java
index 2880816..5c34739 100644
--- a/src/main/java/com/garbagemule/MobArena/things/ItemStackThing.java
+++ b/src/main/java/com/garbagemule/MobArena/things/ItemStackThing.java
@@ -13,12 +13,12 @@ public class ItemStackThing implements Thing {
 
     @Override
     public boolean giveTo(Player player) {
-        return player.getInventory().addItem(stack).isEmpty();
+        return player.getInventory().addItem(stack.clone()).isEmpty();
     }
 
     @Override
     public boolean takeFrom(Player player) {
-        return player.getInventory().removeItem(stack).isEmpty();
+        return player.getInventory().removeItem(stack.clone()).isEmpty();
     }
 
     @Override