diff --git a/scripts/normalize_input.rb b/scripts/normalize_input.rb
index 0255a5b1c325f9dc27e5ccf0fbaeaf0adb6a7f01..b2a7fb6212dc64a329603a52e56909e2aa76d5e5 100755
--- a/scripts/normalize_input.rb
+++ b/scripts/normalize_input.rb
@@ -16,6 +16,12 @@ Dir['input/grid5000/sites/*/clusters/*/nodes/*.yaml'].each do |f|
     na.delete('rate')
   end
 
+  # remove information about OS, which is obsolete anyway
+  d.values.first['operating_system'].delete('kernel')
+  d.values.first['operating_system'].delete('name')
+  d.values.first['operating_system'].delete('version')
+  d.values.first['operating_system'].delete('release')
+
   fd = File::new(f, 'w')
   fd.puts("# Generated by g5k-checks (g5k-checks -m api)")
   fd.puts d.to_yaml