diff --git a/src/corelib/kernel/qcoreapplication_p.h b/src/corelib/kernel/qcoreapplication_p.h
index 0e007e55756..9c14b5eeba7 100644
--- a/src/corelib/kernel/qcoreapplication_p.h
+++ b/src/corelib/kernel/qcoreapplication_p.h
@@ -48,7 +48,7 @@ class Q_CORE_EXPORT QCoreApplicationPrivate
     Q_DECLARE_PUBLIC(QCoreApplication)
 
 public:
-    enum Type {
+    enum Type : quint8 {
         Tty,
         Gui
     };