diff --git a/src/libkdepim/widgets/kcheckcombobox.h b/src/libkdepim/widgets/kcheckcombobox.h
--- a/src/libkdepim/widgets/kcheckcombobox.h
+++ b/src/libkdepim/widgets/kcheckcombobox.h
@@ -152,6 +152,14 @@
      */
     Q_REQUIRED_RESULT QStringList checkedItems(int role = Qt::DisplayRole) const;
 
+    /**
+     * Update the KCheckComboBox text with Item belonging to the role.
+     * @param topLeft Curently unused.
+     * @param bottomRight Curently unused.
+     * @param role The role the updated values belong to.
+     */
+    void updateCheckedItems(const QModelIndex &topLeft = QModelIndex(), const QModelIndex &bottomRight = QModelIndex(), int role = Qt::DisplayRole);
+
 public Q_SLOTS:
     /**
      * Sets the currently selected items. Items that are not found in the model
diff --git a/src/libkdepim/widgets/kcheckcombobox.cpp b/src/libkdepim/widgets/kcheckcombobox.cpp
--- a/src/libkdepim/widgets/kcheckcombobox.cpp
+++ b/src/libkdepim/widgets/kcheckcombobox.cpp
@@ -368,4 +368,9 @@
     }
 }
 
+void KCheckComboBox::updateCheckedItems(const QModelIndex &topLeft, const QModelIndex &bottomRight, int role)
+{
+    d->updateCheckedItems(topLeft, bottomRight, role);
+}
+
 #include "moc_kcheckcombobox.cpp"
diff --git a/src/libkdepimakonadi/widgets/tagselectioncombo.cpp b/src/libkdepimakonadi/widgets/tagselectioncombo.cpp
--- a/src/libkdepimakonadi/widgets/tagselectioncombo.cpp
+++ b/src/libkdepimakonadi/widgets/tagselectioncombo.cpp
@@ -59,8 +59,9 @@
     setModel(checkableProxy);
 
     //We need to reconnect from the constructor of KCheckComboBox to the new model
-    connect(checkableProxy, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
-            this, SLOT(updateCheckedItems(QModelIndex,QModelIndex)));
+    connect(checkableProxy, &QAbstractItemModel::dataChanged, this, [this] (const QModelIndex &topLeft, const QModelIndex &bottomRight) {
+        updateCheckedItems(topLeft, bottomRight);
+    });
 }
 
 TagCombo::TagCombo(QWidget *parent)