diff --git a/src/3rdparty/qtsingleapplication/qtlocalpeer.cpp b/src/3rdparty/qtsingleapplication/qtlocalpeer.cpp
index 4be57a0286cdb..8afab3e079e75 100644
--- a/src/3rdparty/qtsingleapplication/qtlocalpeer.cpp
+++ b/src/3rdparty/qtsingleapplication/qtlocalpeer.cpp
@@ -51,8 +51,8 @@ static const char ack[] = "ack";
 
 QString QtLocalPeer::appSessionId(const QString &appId)
 {
-    QByteArray idc = appId.toUtf8();
-    quint16 idNum = qChecksum(idc.constData(), idc.size());
+    const auto idc = appId.toUtf8();
+    const auto idNum = qChecksum(idc);
     //### could do: two 16bit checksums over separate halves of id, for a 32bit result - improved uniqeness probability. Every-other-char split would be best.
 
     QString res = QLatin1String("qtsingleapplication-")