diff --git a/spec/plainyearmonth.html b/spec/plainyearmonth.html
index f4d4e8ed9..b925921a3 100644
--- a/spec/plainyearmonth.html
+++ b/spec/plainyearmonth.html
@@ -759,10 +759,8 @@ <h1>
         1. If _sign_ &lt; 0, then
           1. Let _oneMonthDuration_ be ! CreateDateDurationRecord(0, 1, 0, 0).
           1. Let _nextMonth_ be ? CalendarDateAdd(_calendar_, _intermediateDate_, _oneMonthDuration_, *"constrain"*).
-          1. Let _endOfMonth_ be BalanceISODate(_nextMonth_.[[Year]], _nextMonth_.[[Month]], _nextMonth_.[[Day]] - 1).
-          1. Assert: ISODateWithinLimits(_endOfMonth_.[[Year]], _endOfMonth_.[[Month]], _endOfMonth_.[[Day]]) is *true*.
-          1. Set _fields_.[[Day]] to CalendarDay(_calendar_, _endOfMonth_).
-          1. Let _date_ be ? CalendarDateFromFields(_calendar_, _fields_, *"constrain"*).
+          1. Let _date_ be BalanceISODate(_nextMonth_.[[Year]], _nextMonth_.[[Month]], _nextMonth_.[[Day]] - 1).
+          1. Assert: ISODateWithinLimits(_date_.[[Year]], _date_.[[Month]], _date_.[[Day]]) is *true*.
         1. Else,
           1. Let _date_ be _intermediateDate_.
         1. Let _durationToAdd_ be ? CreateDateDurationRecord(_duration_.[[Years]], _duration_.[[Months]], _duration_.[[Weeks]], _days_).