diff --git a/tabbox/desktopmodel.cpp b/tabbox/desktopmodel.cpp
index 8415536de3..dbb4a70147 100644
--- a/tabbox/desktopmodel.cpp
+++ b/tabbox/desktopmodel.cpp
@@ -73,6 +73,18 @@ QVariant DesktopModel::data(const QModelIndex& index, int role) const
     }
 }
 
+QString DesktopModel::longestCaption() const
+{
+    QString caption;
+    for (int desktop : m_desktopList) {
+        QString desktopName = tabBox->desktopName(desktop);
+        if (desktopName.size() > caption.size()) {
+            caption = desktopName;
+        }
+    }
+    return caption;
+}
+
 int DesktopModel::columnCount(const QModelIndex& parent) const
 {
     Q_UNUSED(parent)
diff --git a/tabbox/desktopmodel.h b/tabbox/desktopmodel.h
index c412e2cde0..a069e47092 100644
--- a/tabbox/desktopmodel.h
+++ b/tabbox/desktopmodel.h
@@ -59,6 +59,7 @@ public:
     virtual int rowCount(const QModelIndex& parent = QModelIndex()) const;
     virtual QModelIndex parent(const QModelIndex& child) const;
     virtual QModelIndex index(int row, int column, const QModelIndex& parent = QModelIndex()) const;
+    Q_INVOKABLE QString longestCaption() const;
 
     /**
     * Generates a new list of desktops based on the current config.