diff --git a/yt/frontends/ramses/particle_handlers.py b/yt/frontends/ramses/particle_handlers.py
index 3cf181cb1f..ff963e578b 100644
--- a/yt/frontends/ramses/particle_handlers.py
+++ b/yt/frontends/ramses/particle_handlers.py
@@ -315,12 +315,6 @@ def build_iterator():
             )
             self.ds._warned_extra_fields["io"] = True
 
-        # if self.has_birth_file:
-        #     # Sentinel value: this will prevent birth times from being read from
-        #     # the partXXXXX.outYYYYY files
-        #     field_offsets[ptype, "particle_birth_time"] = -1
-        #     _pfields[ptype, "particle_birth_time"] = "d"
-        #     self.ds.use_conformal_time = False
         if (
             self.ds.use_conformal_time
             and (ptype, "particle_birth_time") in field_offsets