diff --git a/src/plugins/qmlprojectmanager/qmlproject.cpp b/src/plugins/qmlprojectmanager/qmlproject.cpp
index a9a883d63f4..e5168626170 100644
--- a/src/plugins/qmlprojectmanager/qmlproject.cpp
+++ b/src/plugins/qmlprojectmanager/qmlproject.cpp
@@ -180,6 +180,12 @@ QString QmlProject::mainFile() const
     return QString();
 }
 
+void QmlProject::setMainFile(const QString &mainFilePath)
+{
+    if (m_projectItem)
+        m_projectItem.data()->setMainFile(mainFilePath);
+}
+
 Utils::FileName QmlProject::targetDirectory(const Target *target) const
 {
     if (DeviceTypeKitInformation::deviceTypeId(target->kit())
diff --git a/src/plugins/qmlprojectmanager/qmlproject.h b/src/plugins/qmlprojectmanager/qmlproject.h
index f3be29287c5..8f7bf30c044 100644
--- a/src/plugins/qmlprojectmanager/qmlproject.h
+++ b/src/plugins/qmlprojectmanager/qmlproject.h
@@ -64,6 +64,7 @@ public:
 
     Utils::FileName canonicalProjectDir() const;
     QString mainFile() const;
+    void setMainFile(const QString &mainFilePath);
     Utils::FileName targetDirectory(const ProjectExplorer::Target *target) const;
     Utils::FileName targetFile(const Utils::FileName &sourceFile,
                                const ProjectExplorer::Target *target) const;
diff --git a/src/plugins/qmlprojectmanager/qmlprojectnodes.cpp b/src/plugins/qmlprojectmanager/qmlprojectnodes.cpp
index 9fcbe3a3053..195681aebef 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectnodes.cpp
+++ b/src/plugins/qmlprojectmanager/qmlprojectnodes.cpp
@@ -28,9 +28,16 @@
 
 #include <coreplugin/idocument.h>
 #include <coreplugin/fileiconprovider.h>
+#include <coreplugin/documentmanager.h>
+#include <coreplugin/editormanager/documentmodel.h>
+#include <coreplugin/editormanager/ieditor.h>
 #include <projectexplorer/projectexplorer.h>
-
+#include <texteditor/textdocument.h>
 #include <utils/algorithm.h>
+#include <utils/textfileformat.h>
+
+#include <QRegularExpression>
+#include <QTextCodec>
 
 using namespace ProjectExplorer;
 
@@ -76,8 +83,45 @@ bool QmlProjectNode::deleteFiles(const QStringList & /*filePaths*/)
     return true;
 }
 
-bool QmlProjectNode::renameFile(const QString & /*filePath*/, const QString & /*newFilePath*/)
+bool QmlProjectNode::renameFile(const QString & filePath, const QString & newFilePath)
 {
+    if (filePath.endsWith(m_project->mainFile())) {
+        m_project->setMainFile(newFilePath);
+
+        // make sure to change it also in the qmlproject file
+        const QString qmlProjectFilePath = m_project->document()->filePath().toString();
+        Core::FileChangeBlocker fileChangeBlocker(qmlProjectFilePath);
+        const QList<Core::IEditor *> editors = Core::DocumentModel::editorsForFilePath(qmlProjectFilePath);
+        TextEditor::TextDocument *document = nullptr;
+        if (!editors.isEmpty()) {
+            document = qobject_cast<TextEditor::TextDocument*>(editors.first()->document());
+            if (document && document->isModified())
+                if (!Core::DocumentManager::saveDocument(document))
+                    return false;
+        }
+
+        QString fileContent;
+        QString error;
+        Utils::TextFileFormat textFileFormat;
+        const QTextCodec *codec = QTextCodec::codecForName("UTF-8"); // qml files are defined to be utf-8
+        if (Utils::TextFileFormat::readFile(qmlProjectFilePath, codec, &fileContent, &textFileFormat, &error)
+                != Utils::TextFileFormat::ReadSuccess) {
+            qWarning() << "Failed to read file" << qmlProjectFilePath << ":" << error;
+        }
+
+        // find the mainFile and do the file name with brackets in a capture group and mask the . with \.
+        QString originalFileName = QFileInfo(filePath).fileName();
+        originalFileName.replace(".", "\\.");
+        const QRegularExpression expression(QString("mainFile:\\s*\"(%1)\"").arg(originalFileName));
+        const QRegularExpressionMatch match = expression.match(fileContent);
+
+        fileContent.replace(match.capturedStart(1), match.capturedLength(1), QFileInfo(newFilePath).fileName());
+
+        if (!textFileFormat.writeFile(qmlProjectFilePath, fileContent, &error))
+            qWarning() << "Failed to write file" << qmlProjectFilePath << ":" << error;
+        m_project->refresh(QmlProject::Everything);
+    }
+
     return true;
 }