diff --git a/prolog/metta_lang/metta_eval.pl b/prolog/metta_lang/metta_eval.pl
index 5411cd2cf..cf678c905 100755
--- a/prolog/metta_lang/metta_eval.pl
+++ b/prolog/metta_lang/metta_eval.pl
@@ -120,7 +120,7 @@
 % is_self_eval_l_fa('=',2).
 % eval_20(Eq,RetType,Depth,Self,['quote',Eval],RetVal):- !, Eval = RetVal, check_returnval(Eq,RetType,RetVal).
 is_self_eval_l_fa('quote',_).
-is_self_eval_l_fa('=',_):- nb_current(evaling_args,t).
+%is_self_eval_l_fa('=',_):- nb_current(evaling_args,t).
 is_self_eval_l_fa(':',_):- nb_current(evaling_args,t).
 is_self_eval_l_fa('Error',_).
 is_self_eval_l_fa('{...}',_).