diff --git a/Source/cmLinkLineComputer.h b/Source/cmLinkLineComputer.h
index bf65347c21..d8dacf3982 100644
--- a/Source/cmLinkLineComputer.h
+++ b/Source/cmLinkLineComputer.h
@@ -41,6 +41,9 @@ public:
                                         std::string const& config);
 
 protected:
+  cmLinkLineComputer(cmLinkLineComputer const&);
+  cmLinkLineComputer& operator=(cmLinkLineComputer const&);
+
   std::string ComputeLinkLibs(cmComputeLinkInformation& cli);
   std::string ComputeRPath(cmComputeLinkInformation& cli);