diff --git a/corsika/detail/modules/TrackWriter.inl b/corsika/detail/modules/TrackWriter.inl
index 39bb395acd18eb4d4b46f80f17833a89a47ebf3b..5a0f8bf7110b14a2e03019595c5e4fba32984f04 100644
--- a/corsika/detail/modules/TrackWriter.inl
+++ b/corsika/detail/modules/TrackWriter.inl
@@ -48,8 +48,7 @@ namespace corsika {
 
     // add default units for values
     node["type"] = "TrackWriter";
-    node["units"]["energy"] = "GeV";
-    node["units"]["length"] = "m";
+    node["units"] = "GeV | m | ns";
 
     return node;
   }