diff --git a/test/auto/qbarseries/tst_qbarseries.cpp b/test/auto/qbarseries/tst_qbarseries.cpp
index b2c7d03..d4cab5a 100644
--- a/test/auto/qbarseries/tst_qbarseries.cpp
+++ b/test/auto/qbarseries/tst_qbarseries.cpp
@@ -393,19 +393,28 @@ void tst_QBarSeries::setLabelsVisible_data()
 
 void tst_QBarSeries::setLabelsVisible()
 {
+    // labels should be invisible by default
     foreach (QBarSet* s, m_testSets) {
         QVERIFY(s->labelsVisible() == false);
     }
 
+    // turn labels to visible
     m_barseries_with_sets->setLabelsVisible(true);
     foreach (QBarSet* s, m_testSets) {
         QVERIFY(s->labelsVisible() == true);
     }
 
+    // turn labels to invisible
     m_barseries_with_sets->setLabelsVisible(false);
     foreach (QBarSet* s, m_testSets) {
         QVERIFY(s->labelsVisible() == false);
     }
+
+    // without parameter, should turn labels to visible
+    m_barseries_with_sets->setLabelsVisible();
+    foreach (QBarSet* s, m_testSets) {
+        QVERIFY(s->labelsVisible() == true);
+    }
 }
 
 /*