diff --git a/companion/src/labels.cpp b/companion/src/labels.cpp
index f994da7b0..6cb4ef92f 100644
--- a/companion/src/labels.cpp
+++ b/companion/src/labels.cpp
@@ -60,6 +60,8 @@ bool LabelsModel::setData(const QModelIndex &index, const QVariant &value, int r
                        this->index(index.row(), 0));
       if(selectedModel != -1 && modelsChanged)
         emit modelChanged(selectedModel);
+    } else {
+      emit renameFault(tr("Unable to rename \"%1\" to \"%2\" the label already exists").arg(replFrom).arg(replTo));
     }
     return true;
   }
diff --git a/companion/src/labels.h b/companion/src/labels.h
index e39dda467..3d836ba8d 100644
--- a/companion/src/labels.h
+++ b/companion/src/labels.h
@@ -45,6 +45,7 @@ private slots:
 
 signals:
   void modelChanged(int index);
+  void renameFault(QString msg);
 
 private:
   QItemSelectionModel *modelsSelection;
diff --git a/companion/src/mdichild.cpp b/companion/src/mdichild.cpp
index 8d06177ca..745c198b4 100644
--- a/companion/src/mdichild.cpp
+++ b/companion/src/mdichild.cpp
@@ -509,6 +509,7 @@ void MdiChild::initModelsList()
   labelsListModel = new LabelsModel(ui->modelsList->selectionModel(),
                                     &radioData, this);
   connect(labelsListModel, &LabelsModel::modelChanged, this, &MdiChild::modelLabelsChanged);
+  connect(labelsListModel, &LabelsModel::renameFault, this, &MdiChild::labelRenameFault);
   ui->lstLabels->setModel(labelsListModel);
   ui->lstLabels->setSelectionMode(QAbstractItemView::SingleSelection);
   ui->lstLabels->setDragEnabled(true);
@@ -1716,6 +1717,11 @@ void MdiChild::modelLabelsChanged()
   refresh();
 }
 
+void MdiChild::labelRenameFault(QString msg)
+{
+  QMessageBox::warning(this, CPN_STR_TTL_WARNING, msg);
+}
+
 unsigned MdiChild::saveModels(const QVector<int> modelIndices)
 {
   unsigned saves = 0;
diff --git a/companion/src/mdichild.h b/companion/src/mdichild.h
index 379eed754..934d09548 100644
--- a/companion/src/mdichild.h
+++ b/companion/src/mdichild.h
@@ -141,6 +141,7 @@ class MdiChild : public QWidget
     void labelAdd();
     void labelDelete();
     void modelLabelsChanged();
+    void labelRenameFault(QString msg);
     void wizardEdit();
     void modelDuplicate();