diff --git a/static/src/app/services/pos_store.js b/static/src/app/services/pos_store.js
index 3e5b2e9..73c3f3a 100644
--- a/static/src/app/services/pos_store.js
+++ b/static/src/app/services/pos_store.js
@@ -142,7 +142,7 @@ patch(PosStore.prototype, {
                                     decimalPart: '',
                                 };
                             }
-                            let value = Reflect.get(target, prop, receiver);
+                            let value = Reflect.get(target, prop, target);
                             if (typeof value === 'function') {
                                 return value.bind(receiver);
                             }
@@ -170,7 +170,7 @@ patch(PosStore.prototype, {
                         if (prop === 'lines') {
                             return changedLines;
                         }
-                        let value = Reflect.get(target, prop, receiver);
+                        let value = Reflect.get(target, prop, target);
                         if (typeof value === 'function') {
                             return value.bind(receiver);
                         }