diff --git a/src/plugins/qmldesigner/components/navigator/navigatortreemodel.cpp b/src/plugins/qmldesigner/components/navigator/navigatortreemodel.cpp
index 99a995e3b1d2cfb07389895b783f0d4958306e25..5e46785fd9f5efbd844f66374cc421a8603189cc 100644
--- a/src/plugins/qmldesigner/components/navigator/navigatortreemodel.cpp
+++ b/src/plugins/qmldesigner/components/navigator/navigatortreemodel.cpp
@@ -302,7 +302,7 @@ void NavigatorTreeModel::handleChangedItem(QStandardItem *item)
              if (node.view()->rewriterView())
                 node.view()->rewriterView()->renameId(node.id(), item->text());
         } else {
-            QMessageBox::warning(0, tr("Invalid Id"), item->text() + tr(" is an invalid id"));
+            QMessageBox::warning(0, tr("Invalid Id"),  tr("%1 is an invalid id").arg(item->text()));
             item->setText(node.id());
         }
     } else if (item == itemRow.visibilityItem) {
diff --git a/src/plugins/qmldesigner/components/propertyeditor/propertyeditor.cpp b/src/plugins/qmldesigner/components/propertyeditor/propertyeditor.cpp
index 24832155730f62c3edaf2c3387940faca4ee0dfa..17ad35291201d062af4545d42b02a08cea826c72 100644
--- a/src/plugins/qmldesigner/components/propertyeditor/propertyeditor.cpp
+++ b/src/plugins/qmldesigner/components/propertyeditor/propertyeditor.cpp
@@ -360,7 +360,7 @@ void PropertyEditor::changeValue(const QString &propertyName)
                 rewriterView()->renameId(m_selectedNode.id(), newId);
         } else {
             value->setValue(m_selectedNode.id());
-            QMessageBox::warning(0, tr("Invalid Id"), newId + tr(" is an invalid id"));
+            QMessageBox::warning(0, tr("Invalid Id"),  tr("%1 is an invalid id").arg(newId));
         }
         return;
     }