diff --git a/src/plugins/output_gadget_hdf5.cc b/src/plugins/output_gadget_hdf5.cc
index a63d34e..bce09d0 100644
--- a/src/plugins/output_gadget_hdf5.cc
+++ b/src/plugins/output_gadget_hdf5.cc
@@ -176,7 +176,7 @@ public:
     case cosmo_species::dm:
       return 1;
     case cosmo_species::baryon:
-      return 2;
+      return 0;
     case cosmo_species::neutrino:
       return 3;
     }