diff --git a/inc/RRule.php b/inc/RRule.php
index 9e058bad..0e4a9661 100644
--- a/inc/RRule.php
+++ b/inc/RRule.php
@@ -1011,7 +1011,7 @@ class RepeatRule {
         $dow = self::rrule_day_number($matches[3]);
         $first_doy = 1 + $dow - $dow_of_first;  if ( $first_doy < 1 ) $first_doy +=7;  // e.g. 1st=WE, dow=MO => 1+1-3=-1 => MO is 6th, etc.
         $whichweek = intval($matches[2]);
-        if ( DEBUG_RRULE ) dbg_error_log( 'RRULE', "Expanding BYDAY(Y) $weekday from date %s", $instance->format('c') );
+        if ( DEBUG_RRULE ) dbg_error_log( 'RRULE', "Expanding BYDAY(Y) $weekday from date %s", $first_of_year->format('c') );
         if ( $whichweek > 0 ) {
           $whichweek--;
           $yearday = $first_doy;