diff --git a/Fit/Param/RealLimits.h b/Fit/Param/RealLimits.h
index c4d8ba3c8eb0b738a875318013c84d992b106841..a1d3a1a0c3fb5c158cca95f53667fccc1a548b18 100644
--- a/Fit/Param/RealLimits.h
+++ b/Fit/Param/RealLimits.h
@@ -101,7 +101,7 @@ public:
     bool isUpperLimited() const;
     bool isLimited() const;
 
-protected:
+private:
     RealLimits(bool has_lower_limit, bool has_upper_limit, double lower_limit, double upper_limit);
 
     bool m_has_lower_limit; //! parameter has lower bound