diff --git a/include/pfs/parsers.hpp b/include/pfs/parsers.hpp
index 465b446..eada61c 100644
--- a/include/pfs/parsers.hpp
+++ b/include/pfs/parsers.hpp
@@ -232,6 +232,8 @@ class task_io_parser : public file_parser<io_stats>
 
 private:
     static value_parsers make_value_parsers();
+
+private:
     static const char DELIM;
     static const value_parsers PARSERS;
 };