diff --git a/appveyor.yml b/appveyor.yml
index 992201a..8bbcd8b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,8 +10,8 @@ environment:
   MAKE_RUN_TESTS: true #experimental
 
   matrix:
-    - PLATFORM: mingw53_32
     - PLATFORM: msvc2017_64
+    - PLATFORM: mingw53_32
     - PLATFORM: winrt_x64_msvc2017
     - PLATFORM: winrt_x86_msvc2017
     - PLATFORM: winrt_armv7_msvc2017
diff --git a/src/mvvmcore/viewmodel.cpp b/src/mvvmcore/viewmodel.cpp
index 99a3fdf..c5a3af4 100644
--- a/src/mvvmcore/viewmodel.cpp
+++ b/src/mvvmcore/viewmodel.cpp
@@ -64,7 +64,7 @@ void ViewModel::showForResult(quint32 requestCode, const QMetaObject *viewMetaOb
 	showImp(viewMetaObject, params, const_cast<ViewModel*>(this), requestCode);
 }
 
-void ViewModel::showImp(const QMetaObject *metaObject, QVariantHash params, QPointer<ViewModel> parent, quint32 requestCode)
+void ViewModel::showImp(const QMetaObject *metaObject, const QVariantHash &params, QPointer<ViewModel> parent, quint32 requestCode)
 {
 	QMetaObject::invokeMethod(CoreAppPrivate::dInstance().data(), "showViewModel", Qt::QueuedConnection,
 							  Q_ARG(const QMetaObject*, metaObject),
diff --git a/src/mvvmcore/viewmodel.h b/src/mvvmcore/viewmodel.h
index 1e844a6..7125477 100644
--- a/src/mvvmcore/viewmodel.h
+++ b/src/mvvmcore/viewmodel.h
@@ -61,7 +61,7 @@ private:
 
 	QScopedPointer<ViewModelPrivate> d;
 
-	static void showImp(const QMetaObject *metaObject, QVariantHash params, QPointer<ViewModel> parent, quint32 requestCode = 0);
+	static void showImp(const QMetaObject *metaObject, const QVariantHash &params, QPointer<ViewModel> parent, quint32 requestCode = 0);
 };
 
 //TODO doc
diff --git a/tests/auto/qml/qmlsettingsgenerator/tst_qmlsettingsgenerator.qmlc b/tests/auto/qml/qmlsettingsgenerator/tst_qmlsettingsgenerator.qmlc
index 795e1c4..6d26ab3 100644
Binary files a/tests/auto/qml/qmlsettingsgenerator/tst_qmlsettingsgenerator.qmlc and b/tests/auto/qml/qmlsettingsgenerator/tst_qmlsettingsgenerator.qmlc differ