diff --git a/Source/cmCLocaleEnvironmentScope.h b/Source/cmCLocaleEnvironmentScope.h
index c4065e1310..1e7c42ada1 100644
--- a/Source/cmCLocaleEnvironmentScope.h
+++ b/Source/cmCLocaleEnvironmentScope.h
@@ -15,6 +15,9 @@ public:
   ~cmCLocaleEnvironmentScope();
 
 private:
+  cmCLocaleEnvironmentScope(cmCLocaleEnvironmentScope const&);
+  cmCLocaleEnvironmentScope& operator=(cmCLocaleEnvironmentScope const&);
+
   std::string GetEnv(std::string const& key);
   void SetEnv(std::string const& key, std::string const& value);