diff --git a/test/auto/qlineseries/tst_qlineseries.cpp b/test/auto/qlineseries/tst_qlineseries.cpp
index e2f0515..6469142 100644
--- a/test/auto/qlineseries/tst_qlineseries.cpp
+++ b/test/auto/qlineseries/tst_qlineseries.cpp
@@ -289,6 +289,10 @@ void tst_QLineSeries::pen()
     m_chart->addSeries(&series);
 
     if(pen!=QPen()) QCOMPARE(series.pen(), pen);
+
+    m_chart->setTheme(QChart::ChartThemeDark);
+
+    if(pen!=QPen()) QCOMPARE(series.pen(), pen);
 }
 
 void tst_QLineSeries::pointsVisible_data()