diff --git a/app/ecs-components/inventory.js b/app/ecs-components/inventory.js
index 380e9aa..bf9dd1c 100644
--- a/app/ecs-components/inventory.js
+++ b/app/ecs-components/inventory.js
@@ -2,7 +2,6 @@ import Schema from '@/ecs/schema.js';
 
 export default function(Component) {
   return class Inventory extends Component {
-
     insertMany(entities) {
       for (const [id, {slotChange}] of entities) {
         if (slotChange) {
@@ -22,7 +21,6 @@ export default function(Component) {
       }
       return super.insertMany(entities);
     }
-
     mergeDiff(original, update) {
       if (!update.slotChange) {
         return super.mergeDiff(original, update);
@@ -57,6 +55,7 @@ export default function(Component) {
             target[property] = value;
             if ('qty' === property && value <= 0) {
               Component.markChange(instance.entity, 'slotChange', {[slot]: false});
+              delete slots[slot];
             }
             else {
               Component.markChange(instance.entity, 'slotChange', {[slot]: {[property]: value}});