diff --git a/include/spdlog/sinks/qt_sinks.h b/include/spdlog/sinks/qt_sinks.h
index ebfed022..1a40638d 100644
--- a/include/spdlog/sinks/qt_sinks.h
+++ b/include/spdlog/sinks/qt_sinks.h
@@ -49,7 +49,7 @@ protected:
     {
         memory_buf_t formatted;
         base_sink<Mutex>::formatter_->format(msg, formatted);
-        string_view_t str = string_view_t(formatted.data(), formatted.size());
+        const string_view_t str = string_view_t(formatted.data(), formatted.size());
         QMetaObject::invokeMethod(qt_object_, meta_method_.c_str(), Qt::AutoConnection,
             Q_ARG(QString, QString::fromUtf8(str.data(), static_cast<int>(str.size())).trimmed()));
     }