diff --git a/src/gui/util/qvalidator.h b/src/gui/util/qvalidator.h
index cc7cbcb559..f0e72e3814 100644
--- a/src/gui/util/qvalidator.h
+++ b/src/gui/util/qvalidator.h
@@ -69,6 +69,7 @@ public:
         Intermediate,
         Acceptable
     };
+    Q_ENUM(State)
 
     void setLocale(const QLocale &locale);
     QLocale locale() const;