diff --git a/src/plugins/projectexplorer/projectmodels.cpp b/src/plugins/projectexplorer/projectmodels.cpp
index 6a5d44589db..a628d6df75b 100644
--- a/src/plugins/projectexplorer/projectmodels.cpp
+++ b/src/plugins/projectexplorer/projectmodels.cpp
@@ -308,12 +308,14 @@ bool FlatModel::setData(const QModelIndex &index, const QVariant &value, int rol
     if (orgFilePath != newFilePath && orgFilePath.suffix() == newFilePath.suffix()) {
         const QList<Node *> candidateNodes = ProjectTree::siblingsWithSameBaseName(node);
         if (!candidateNodes.isEmpty()) {
+            QStringList fileNames = transform<QStringList>(candidateNodes, [](const Node *n) {
+                return n->filePath().fileName();
+            });
+            fileNames.removeDuplicates();
             const QMessageBox::StandardButton reply = QMessageBox::question(
                         Core::ICore::dialogParent(), tr("Rename More Files?"),
                         tr("Would you like to rename these files as well?\n    %1")
-                        .arg(transform<QStringList>(candidateNodes, [](const Node *n) {
-                                 return n->filePath().fileName();
-                             }).join("\n    ")));
+                        .arg(fileNames.join("\n    ")));
             if (reply == QMessageBox::Yes) {
                 for (Node * const n : candidateNodes) {
                     QString targetFilePath = orgFileInfo.absolutePath() + '/'