diff --git a/Source/CPack/cmCPackGenerator.cxx b/Source/CPack/cmCPackGenerator.cxx
index 22d4bf06d7..3eca280cce 100644
--- a/Source/CPack/cmCPackGenerator.cxx
+++ b/Source/CPack/cmCPackGenerator.cxx
@@ -723,10 +723,9 @@ int cmCPackGenerator::InstallProjectViaInstallCMakeProjects(
         cmGlobalGenerator gg(&cm);
         cmsys::auto_ptr<cmMakefile> mf(
               new cmMakefile(&gg, cm.GetCurrentSnapshot()));
-        std::string realInstallDirectory = tempInstallDirectory;
         if ( !installSubDirectory.empty() && installSubDirectory != "/" )
           {
-          realInstallDirectory += installSubDirectory;
+          tempInstallDirectory += installSubDirectory;
           }
         if (componentInstall)
           {