diff --git a/oscar/Graphs/gLineOverlay.cpp b/oscar/Graphs/gLineOverlay.cpp
index 9ae0ddd4..b2d731cf 100644
--- a/oscar/Graphs/gLineOverlay.cpp
+++ b/oscar/Graphs/gLineOverlay.cpp
@@ -223,7 +223,10 @@ void gLineOverlayBar::paint(QPainter &painter, gGraph &w, const QRegion &region)
                             painter.drawRect(rect);
 
                             // Queue tooltip
-                            QString lab2 = QString("%1 (%2)").arg(schema::channel[m_code].fullname()).arg(raw);
+                            QString lab2 = QString("%1").arg(schema::channel[m_code].fullname());
+                            if (raw != 0)  // Hide duration when it is zero
+                                lab2 += QString(" (%1)").arg(raw);
+
                             w.ToolTip(lab2, x1 - 10, start_py + 24 + (3 * w.printScaleY()), TT_AlignRight, AppSetting->tooltipTimeout());
 
                             painter.setPen(QPen(col,3));