diff --git a/x/logic/interpreter/registry.go b/x/logic/interpreter/registry.go
index 6b5da221..ee1e71dd 100644
--- a/x/logic/interpreter/registry.go
+++ b/x/logic/interpreter/registry.go
@@ -90,9 +90,7 @@ var registry = orderedmap.New[string, any](
 		{Key: "char_code/2", Value: engine.CharCode},
 		{Key: "number_chars/2", Value: engine.NumberChars},
 		{Key: "number_codes/2", Value: engine.NumberCodes},
-		{Key: "set_prolog_flag/2", Value: engine.SetPrologFlag},
 		{Key: "current_prolog_flag/2", Value: engine.CurrentPrologFlag},
-		{Key: "halt/1", Value: engine.Halt},
 		{Key: "consult/1", Value: predicate.Consult},
 		{Key: "phrase/3", Value: engine.Phrase},
 		{Key: "expand_term/2", Value: engine.ExpandTerm},