diff --git a/addons/l10n_fr_pos_cert/static/src/js/pos.js b/addons/l10n_fr_pos_cert/static/src/js/pos.js
index ebe93775487..da84fde49fd 100644
--- a/addons/l10n_fr_pos_cert/static/src/js/pos.js
+++ b/addons/l10n_fr_pos_cert/static/src/js/pos.js
@@ -20,6 +20,12 @@ patch(PosStore.prototype, {
     },
     disallowLineQuantityChange() {
         const result = super.disallowLineQuantityChange(...arguments);
+        let selectedOrderLine = this.selectedOrder.get_selected_orderline();
+        //Note: is_reward_line is a field in the pos_loyalty module
+        if (selectedOrderLine.is_reward_line) {
+            //Always allow quantity change for reward lines
+            return false || result;
+        }
         return this.is_french_country() || result;
     },
 });