diff --git a/src/corelib/kernel/qcoreapplication_p.h b/src/corelib/kernel/qcoreapplication_p.h
index 3d9beaa9bed..b027a2885ef 100644
--- a/src/corelib/kernel/qcoreapplication_p.h
+++ b/src/corelib/kernel/qcoreapplication_p.h
@@ -51,7 +51,7 @@ class Q_CORE_EXPORT QCoreApplicationPrivate
     Q_DECLARE_PUBLIC(QCoreApplication)
 
 public:
-    enum Type {
+    enum Type : quint8 {
         Tty,
         Gui
     };