diff --git a/CommandLineArguments.cxx b/CommandLineArguments.cxx
index 59ee6a97afc202047fee016ada97341891461f7b..0352b6abc4137c01d214930190685172f4a9370c 100644
--- a/CommandLineArguments.cxx
+++ b/CommandLineArguments.cxx
@@ -660,7 +660,7 @@ void CommandLineArguments::GenerateHelp()
           skip = cc;
           }
         }
-      str.write(ptr, static_cast<kwsys_stl::streamsize>(skip));
+      str.write(ptr, static_cast<kwsys_ios::streamsize>(skip));
       str << kwsys_ios::endl;
       ptr += skip;
       len -= skip;