diff --git a/src/plugins/autotest/gtest/gtesttreeitem.cpp b/src/plugins/autotest/gtest/gtesttreeitem.cpp
index 3b2c680fe98..b0f11830383 100644
--- a/src/plugins/autotest/gtest/gtesttreeitem.cpp
+++ b/src/plugins/autotest/gtest/gtesttreeitem.cpp
@@ -295,7 +295,10 @@ QSet<QString> GTestTreeItem::internalTargets() const
     const auto cppMM = CppTools::CppModelManager::instance();
     const auto projectInfo = cppMM->projectInfo(ProjectExplorer::SessionManager::startupProject());
     const QString file = filePath();
-    for (const CppTools::ProjectPart::Ptr projectPart : projectInfo.projectParts()) {
+    const QVector<CppTools::ProjectPart::Ptr> projectParts = projectInfo.projectParts();
+    if (projectParts.isEmpty())
+        return TestTreeItem::dependingInternalTargets(cppMM, file);
+    for (const CppTools::ProjectPart::Ptr projectPart : projectParts) {
         if (projectPart->projectFile == proFile()
                 && Utils::anyOf(projectPart->files, [&file] (const CppTools::ProjectFile &pf) {
                                 return pf.path == file;
diff --git a/src/plugins/autotest/testtreeitem.cpp b/src/plugins/autotest/testtreeitem.cpp
index d27c689e5b0..05eab8439fd 100644
--- a/src/plugins/autotest/testtreeitem.cpp
+++ b/src/plugins/autotest/testtreeitem.cpp
@@ -288,6 +288,9 @@ QSet<QString> TestTreeItem::internalTargets() const
 {
     auto cppMM = CppTools::CppModelManager::instance();
     const QList<CppTools::ProjectPart::Ptr> projectParts = cppMM->projectPart(m_filePath);
+    // if we have no project parts it's most likely a header with declarations only and CMake based
+    if (projectParts.isEmpty())
+        return TestTreeItem::dependingInternalTargets(cppMM, m_filePath);
     QSet<QString> targets;
     for (const CppTools::ProjectPart::Ptr part : projectParts) {
         targets.insert(part->buildSystemTarget + '|' + part->projectFile);