diff --git a/samples/client/petstore/cpp-qt/client/PFXServerConfiguration.h b/samples/client/petstore/cpp-qt/client/PFXServerConfiguration.h
index 42e7504dcaa..12541d41cfc 100644
--- a/samples/client/petstore/cpp-qt/client/PFXServerConfiguration.h
+++ b/samples/client/petstore/cpp-qt/client/PFXServerConfiguration.h
@@ -54,7 +54,7 @@ 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);