diff --git a/lib/calendar.ts b/lib/calendar.ts
index e3f5c132..c216cf35 100644
--- a/lib/calendar.ts
+++ b/lib/calendar.ts
@@ -61,8 +61,22 @@ export class Calendar implements Temporal.Calendar {
   fields(fields) {
     if (!ES.IsTemporalCalendar(this)) throw new TypeError('invalid receiver');
     const fieldsArray = [];
+    const allowed = new Set([
+      'year',
+      'month',
+      'monthCode',
+      'day',
+      'hour',
+      'minute',
+      'second',
+      'millisecond',
+      'microsecond',
+      'nanosecond'
+    ]);
     for (const name of fields) {
       if (ES.Type(name) !== 'String') throw new TypeError('invalid fields');
+      if (!allowed.has(name)) throw new RangeError(`invalid field name ${name}`);
+      allowed.delete(name);
       ArrayPrototypePush.call(fieldsArray, name);
     }
     return impl[GetSlot(this, CALENDAR_ID)].fields(fieldsArray);