1 files changed, 1 insertions, 1 deletions

diff --git a/src/fns.c b/src/fns.c
index 556aaa38f28..3c39364a475 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -871,7 +871,7 @@ do_cdr:
   if (XTYPE (o1) == Lisp_Marker)
     {
       return ((XMARKER (o1)->buffer == XMARKER (o2)->buffer
-              && (NILP (XMARKER (o1)->buffer)
+              && (XMARKER (o1)->buffer == 0
                   || XMARKER (o1)->bufpos == XMARKER (o2)->bufpos))
               ? Qt : Qnil);
     }