diff --git a/lib/ctu.h b/lib/ctu.h
index 6383e8f8d..f743b6bee 100644
--- a/lib/ctu.h
+++ b/lib/ctu.h
@@ -33,7 +33,7 @@
 namespace CTU {
     class CPPCHECKLIB FileInfo : public Check::FileInfo {
     public:
-        enum InvalidValueType { null, uninit, bufferOverflow };
+        enum class InvalidValueType { null, uninit, bufferOverflow };
 
         std::string toString() const OVERRIDE;