diff --git a/Source/CPack/cmCPackGenerator.cxx b/Source/CPack/cmCPackGenerator.cxx
index a8e104bd2..3915b31e8 100644
--- a/Source/CPack/cmCPackGenerator.cxx
+++ b/Source/CPack/cmCPackGenerator.cxx
@@ -1089,7 +1089,7 @@ int cmCPackGenerator::DoPackage()
    * may update this during PackageFiles.
    * (either putting several names or updating the provided one)
    */
-  packageFileNames.push_back(tempPackageFileName);
+  packageFileNames.push_back(tempPackageFileName ? tempPackageFileName : "");
   toplevel = tempDirectory;
   if ( !this->PackageFiles() || cmSystemTools::GetErrorOccuredFlag())
     {