diff --git a/src/barchart/qhbarmodelmapper.cpp b/src/barchart/qhbarmodelmapper.cpp
index c8fee85..2f516a9 100644
--- a/src/barchart/qhbarmodelmapper.cpp
+++ b/src/barchart/qhbarmodelmapper.cpp
@@ -5,6 +5,7 @@ QTCOMMERCIALCHART_BEGIN_NAMESPACE
 QHBarModelMapper::QHBarModelMapper(QObject *parent) :
     QBarModelMapper(parent)
 {
+    QBarModelMapper::setOrientation(Qt::Horizontal);
 }
 
 int QHBarModelMapper::firstBarRow() const
diff --git a/src/barchart/qvbarmodelmapper.cpp b/src/barchart/qvbarmodelmapper.cpp
index 206be46..548bac9 100644
--- a/src/barchart/qvbarmodelmapper.cpp
+++ b/src/barchart/qvbarmodelmapper.cpp
@@ -5,6 +5,7 @@ QTCOMMERCIALCHART_BEGIN_NAMESPACE
 QVBarModelMapper::QVBarModelMapper(QObject *parent) :
     QBarModelMapper(parent)
 {
+    QBarModelMapper::setOrientation(Qt::Vertical);
 }
 
 int QVBarModelMapper::firstBarColumn() const