diff --git a/cmd/cart/pool-server.go b/cmd/cart/pool-server.go
index b71986f..59f64b4 100644
--- a/cmd/cart/pool-server.go
+++ b/cmd/cart/pool-server.go
@@ -177,18 +177,20 @@ type SetCartItems struct {
 
 func getMultipleAddMessages(items []Item, country string) []proto.Message {
 	wg := sync.WaitGroup{}
+	mu := sync.Mutex{}
 	msgs := make([]proto.Message, 0, len(items))
 	for _, itm := range items {
-		wg.Add(1)
-		go func(itm Item) {
-			defer wg.Done()
-			msg, err := GetItemAddMessage(itm.Sku, itm.Quantity, country, itm.StoreId)
-			if err != nil {
-				log.Printf("error adding item %s: %v", itm.Sku, err)
-				return
-			}
-			msgs = append(msgs, msg)
-		}(itm)
+		wg.Go(
+			func() {
+				msg, err := GetItemAddMessage(itm.Sku, itm.Quantity, country, itm.StoreId)
+				if err != nil {
+					log.Printf("error adding item %s: %v", itm.Sku, err)
+					return
+				}
+				mu.Lock()
+				msgs = append(msgs, msg)
+				mu.Unlock()
+			})
 	}
 	wg.Wait()
 	return msgs