diff --git a/library/src/configuration.cpp b/library/src/configuration.cpp
index 30f0b73..85e42ff 100644
--- a/library/src/configuration.cpp
+++ b/library/src/configuration.cpp
@@ -583,7 +583,7 @@ int Configuration::getPaymentOptionIndex(QDateTime const &dt) const {
         if (sd.ped_id != 0) {
             for (int opt=0; opt < numOptions; ++opt) {
                 uint64_t const pop_id = getPaymentOptions(opt).pop_id;
-                if (pop_id == sd.ped_payment_option_id) {
+                if (pop_id == (uint64_t)sd.ped_payment_option_id) {
                     return opt;
                 }
             }