diff --git a/tests/manual/widgets/common/themeselector.cpp b/tests/manual/widgets/common/themeselector.cpp
index bf1a5b3a026..809f64acc54 100644
--- a/tests/manual/widgets/common/themeselector.cpp
+++ b/tests/manual/widgets/common/themeselector.cpp
@@ -35,9 +35,11 @@
 #include <QDir>
 #include <QSettings>
 
+namespace ManualTest {
+
 static const char themeNameKey[] = "ThemeName";
 
-static void setTheme(const QString &themeFile)
+void ThemeSelector::setTheme(const QString &themeFile)
 {
     using namespace Utils;
 
@@ -50,7 +52,7 @@ static void setTheme(const QString &themeFile)
     QApplication::setPalette(theme.palette());
 }
 
-ManualTest::ThemeSelector::ThemeSelector(QWidget *parent)
+ThemeSelector::ThemeSelector(QWidget *parent)
     : QComboBox(parent)
 {
     QCoreApplication::setOrganizationName("QtProject");
@@ -71,3 +73,5 @@ ManualTest::ThemeSelector::ThemeSelector(QWidget *parent)
         appSettings.setValue(themeNameKey, currentText());
     });
 }
+
+} // namespace ManualTest
diff --git a/tests/manual/widgets/common/themeselector.h b/tests/manual/widgets/common/themeselector.h
index 0989390373d..2a8375fa83f 100644
--- a/tests/manual/widgets/common/themeselector.h
+++ b/tests/manual/widgets/common/themeselector.h
@@ -32,6 +32,8 @@ namespace ManualTest {
 class ThemeSelector : public QComboBox {
 public:
     ThemeSelector(QWidget *parent = nullptr);
+
+    static void setTheme(const QString &themeFile);
 };
 
-}
+} // namespace ManualTest