diff --git a/src/barchart/barvalue.cpp b/src/barchart/barvalue.cpp
index ea3c049..c0c8512 100644
--- a/src/barchart/barvalue.cpp
+++ b/src/barchart/barvalue.cpp
@@ -70,6 +70,7 @@ void BarValue::setPos(qreal x, qreal y)
 
 void BarValue::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
+    Q_UNUSED(painter)
     Q_UNUSED(option)
     Q_UNUSED(widget)
 }