diff --git a/main/field.c b/main/field.c
index c0e220a6ff..6c3a1ac1f2 100644
--- a/main/field.c
+++ b/main/field.c
@@ -1371,6 +1371,8 @@ extern int defineField (fieldDefinition *def, langType language)
 	fobj->sibling  = FIELD_UNKNOWN;
 
 	updateSiblingField (def->ftype, def->name);
+	installOptscriptFieldAccessor (def->ftype);
+
 	return def->ftype;
 }
 
diff --git a/main/lregex.c b/main/lregex.c
index 2d6c84f509..cd8d0011c8 100644
--- a/main/lregex.c
+++ b/main/lregex.c
@@ -4564,6 +4564,19 @@ static struct optscriptOperatorRegistration lropOperators [] = {
 	},
 };
 
+extern bool installOptscriptFieldAccessor (fieldType ftype)
+{
+	/* This function is called via defineField().
+	   defineField() is called via --fielddef option of built-in parsers
+	   defining their specific fields.
+	   built-in parsers are initialized lazily in the current implementation.
+	   optvm is initialized earlier than parsers. */
+	Assert (!es_null(lregex_dict));
+
+	optscriptInstallFieldAccessor (lregex_dict, ftype);
+	return true;
+}
+
 extern void initRegexOptscript (void)
 {
 	if (!regexAvailable)
diff --git a/main/lregex_p.h b/main/lregex_p.h
index 103944f2f1..9ada840b71 100644
--- a/main/lregex_p.h
+++ b/main/lregex_p.h
@@ -19,6 +19,7 @@
 *   INCLUDE FILES
 */
 #include "general.h"
+#include "field.h"
 #include "flags_p.h"
 #include "kind_p.h"
 #include "lregex.h"
@@ -114,6 +115,8 @@ extern void extendRegexTable (struct lregexControlBlock *lcb, const char *src, c
 extern void initRegexOptscript (void);
 extern void listRegexOpscriptOperators (FILE *fp);
 
+extern bool installOptscriptFieldAccessor (fieldType ftype);
+
 extern void addOptscriptToHook (struct lregexControlBlock *lcb, enum scriptHook hook, const char *code);
 extern void propagateParamToOptscript (struct lregexControlBlock *lcb, const char *param, const char *value);
 
diff --git a/main/options.c b/main/options.c
index 27dca2da6a..b28eb34d9f 100644
--- a/main/options.c
+++ b/main/options.c
@@ -2320,6 +2320,7 @@ static void processListSubparsersOptions (const char *const option CTAGS_ATTR_UN
 static void processListOperators (const char *const option CTAGS_ATTR_UNUSED,
 								  const char *const parameter)
 {
+	initializeParser (LANG_AUTO);
 	listRegexOpscriptOperators (stdout);
 	exit (0);
 }
diff --git a/main/script.c b/main/script.c
index 4b3f17a1fa..eeeee36951 100644
--- a/main/script.c
+++ b/main/script.c
@@ -167,12 +167,22 @@ static EsObject* lrop_set_field_value (OptVM *vm, EsObject *name)
 	return es_false;
 }
 
-static void optscriptInstallFieldGetter (EsObject *dict, fieldType ftype,
-										 vString *op_name, vString *op_desc)
+static void optscriptInstallFieldGetterFast (EsObject *dict, fieldType ftype,
+											 vString *op_name, vString *op_desc)
 {
-	const char *fname = getFieldName (ftype);
 	vStringPut (op_name, ':');
+
+	langType lang = getFieldLanguage (ftype);
+	if (lang != LANG_IGNORE)
+	{
+		const char *lname = getLanguageName (lang);
+		vStringCatS (op_name, lname);
+		vStringPut (op_name, '.');
+	}
+
+	const char *fname = getFieldName (ftype);
 	vStringCatS (op_name, fname);
+
 	EsObject *op_sym = es_symbol_intern (vStringValue (op_name));
 	es_symbol_set_data (op_sym, HT_INT_TO_PTR (ftype));
 
@@ -213,9 +223,17 @@ static void optscriptInstallFieldGetter (EsObject *dict, fieldType ftype,
 	es_object_unref (op);
 }
 
-static void optscriptInstallFieldSetter (EsObject *dict, fieldType ftype,
-										 vString *op_name, vString *op_desc)
+static void optscriptInstallFieldSetterFast (EsObject *dict, fieldType ftype,
+											 vString *op_name, vString *op_desc)
 {
+	langType lang = getFieldLanguage (ftype);
+	if (lang != LANG_IGNORE)
+	{
+		const char *lname = getLanguageName (lang);
+		vStringCatS (op_name, lname);
+		vStringPut (op_name, '.');
+	}
+
 	const char *fname = getFieldName (ftype);
 	vStringCatS (op_name, fname);
 	vStringPut (op_name, ':');
@@ -252,22 +270,46 @@ static void optscriptInstallFieldSetter (EsObject *dict, fieldType ftype,
 	es_object_unref (op);
 }
 
+extern void optscriptInstallFieldAccessor (EsObject *dict, fieldType ftype)
+{
+	vString *op_name = vStringNew ();
+	vString *op_desc = vStringNew ();
+
+	if (hasFieldGetter (ftype))
+	{
+		optscriptInstallFieldGetterFast (dict, ftype, op_name, op_desc);
+		vStringClear (op_name);
+		vStringClear (op_desc);
+	}
+
+	if (hasFieldSetter (ftype))
+		optscriptInstallFieldSetterFast (dict, ftype, op_name, op_desc);
+
+	vStringDelete (op_name);
+	vStringDelete (op_desc);
+}
+
 static void optscriptInstallFieldAccessors (EsObject *dict)
 {
 	vString *op_name = vStringNew ();
 	vString *op_desc = vStringNew ();
 
+	/* In the current implementation, the upper boundary of the loop
+	   can be "<= FIELD_BUILTIN_LAST" because the parser specific fields
+	   are registered via defineField. However, when we change the order
+	   and the way to initialize parsers, we may have to use "< countFields()"
+	   instead. */
 	for (fieldType ftype = 0; ftype <= FIELD_BUILTIN_LAST; ftype++)
 	{
 		if (hasFieldGetter (ftype))
 		{
-			optscriptInstallFieldGetter (dict, ftype, op_name, op_desc);
+			optscriptInstallFieldGetterFast (dict, ftype, op_name, op_desc);
 			vStringClear (op_name);
 			vStringClear (op_desc);
 		}
 		if (hasFieldSetter (ftype))
 		{
-			optscriptInstallFieldSetter (dict, ftype, op_name, op_desc);
+			optscriptInstallFieldSetterFast (dict, ftype, op_name, op_desc);
 			vStringClear (op_name);
 			vStringClear (op_desc);
 		}
diff --git a/main/script_p.h b/main/script_p.h
index bf5d8cc5b0..86197f4088 100644
--- a/main/script_p.h
+++ b/main/script_p.h
@@ -13,6 +13,7 @@
 
 #include "general.h"  /* must always come first */
 
+#include "field.h"
 #include "optscript.h"
 #include "mio.h"
 
@@ -33,6 +34,7 @@ extern EsObject *OPTSCRIPT_ERR_LANGMISMATCH;
 extern OptVM *optscriptInit (void);
 
 extern void optscriptInstallProcs (EsObject *dict, OptOperatorFn matchResultAccessor);
+extern void optscriptInstallFieldAccessor (EsObject *dict, fieldType ftype);
 
 extern void optscriptSetup (OptVM *vm, EsObject *dict, int corkIndex);
 extern void optscriptTeardown (OptVM *vm, EsObject *dict);