diff --git a/time/mktime.c b/time/mktime.c
index 3a951b2c8c..0981cd1d1d 100644
--- a/time/mktime.c
+++ b/time/mktime.c
@@ -356,8 +356,8 @@ __mktime_internal (struct tm *tp, bool local, mktime_offset_t *offset)
   int mon = tp->tm_mon;
   int year_requested = tp->tm_year;
 
-  /* If the timezone never observes DST, ignore any tm_isdst request.  */
-  int isdst = local && __daylight ? tp->tm_isdst : 0;
+  /* Ignore any tm_isdst request for timegm.  */
+  int isdst = local ? tp->tm_isdst : 0;
 
   /* 1 if the previous probe was DST.  */
   int dst2 = 0;