diff --git a/src/gravity/Default/gravity_io.h b/src/gravity/Default/gravity_io.h
index 2150b3c445eb8fbd109e209508269e81d2e773c3..1ba3899e7ecc346227c10679bb8b704937c625b2 100644
--- a/src/gravity/Default/gravity_io.h
+++ b/src/gravity/Default/gravity_io.h
@@ -104,7 +104,7 @@ INLINE static void darkmatter_write_particles(const struct gpart* gparts,
                                               int* num_fields) {
 
   /* Say how much we want to write */
-  *num_fields = 5;
+  *num_fields = 4;
 
   /* List what we want to write */
   list[0] = io_make_output_field_convert_gpart(