diff --git a/minutor.pro b/minutor.pro
index 8641f678..b202398a 100644
--- a/minutor.pro
+++ b/minutor.pro
@@ -2,6 +2,7 @@ TEMPLATE = app
 TARGET = minutor
 CONFIG += c++14
 QT += widgets network concurrent
+greaterThan(QT_MAJOR_VERSION, 5) QT += core5compat
 QMAKE_INFO_PLIST = minutor.plist
 unix:LIBS += -lz
 win32:RC_FILE += winicon.rc
diff --git a/overlay/propertietreecreator.cpp b/overlay/propertietreecreator.cpp
index 8cbc4274..bb9f382a 100644
--- a/overlay/propertietreecreator.cpp
+++ b/overlay/propertietreecreator.cpp
@@ -38,7 +38,7 @@ QString EvaluateSubExpression(const QString& subexpr, const QVariant& v) {
     int rightbracket = subexpr.indexOf(']');
     if (rightbracket > 0) {
       bool ok = false;
-      int index = subexpr.midRef(1, rightbracket-1).toInt(&ok);
+      int index = subexpr.mid(1, rightbracket-1).toInt(&ok);
       if (ok && (QMetaType::Type)v.type() == QMetaType::QVariantList) {
         return EvaluateSubExpression(subexpr.mid(rightbracket + 1),
                                      v.toList().at(index));