diff --git a/pkg/nowpayments/nowpayments.go b/pkg/nowpayments/nowpayments.go
index cbff8656..6128a770 100644
--- a/pkg/nowpayments/nowpayments.go
+++ b/pkg/nowpayments/nowpayments.go
@@ -114,7 +114,7 @@ func (s *NowPayments) WebhookFunc(w http.ResponseWriter, r *http.Request) {
 
 func (s *NowPayments) CreateInvoice(priceUSD int, orderID string) (string, error) {
 	url := fmt.Sprintf("%s/v1/invoice", s.apiURL)
-	jsonStr := fmt.Sprintf(`{"price_amount":%d,"price_currency":"usd","order_id":"%q","is_fee_paid_by_user":true}`,
+	jsonStr := fmt.Sprintf(`{"price_amount":%d,"price_currency":"usd","order_id":%q,"is_fee_paid_by_user":true}`,
 		priceUSD, orderID)
 
 	req, err := http.NewRequestWithContext(s.ctx, http.MethodPost, url, bytes.NewBufferString(jsonStr))