diff --git a/modules/openapi-generator/src/main/resources/cpp-qt-client/ServerConfiguration.mustache b/modules/openapi-generator/src/main/resources/cpp-qt-client/ServerConfiguration.mustache
index f4e36bb4a81..59a30435e0a 100644
--- a/modules/openapi-generator/src/main/resources/cpp-qt-client/ServerConfiguration.mustache
+++ b/modules/openapi-generator/src/main/resources/cpp-qt-client/ServerConfiguration.mustache
@@ -46,7 +46,7 @@ public:
                 QString value = serverVariable._defaultValue;
 
                 if (!serverVariable._enumValues.empty() && !serverVariable._enumValues.contains(value)) {
-                    throw std::runtime_error(QString("The variable " + name + " in the server URL has invalid value " + value + ".").toUtf8());
+                    throw std::runtime_error(QString("The variable " + name + " in the server URL has invalid value " + value + ".").toUtf8().toStdString());
                 }
                 QRegularExpression regex(QString("\\{" + name + "\\}"));
                 url = url.replace(regex, value);