diff --git a/src/ChangeLog b/src/ChangeLog
index 2a8fc8e3f17..c0b86a16593 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,8 @@
 2007-12-24  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
 
+	* process.c (make_process): Initialize pty_flag to Qnil instead of 0
+	as it is not a bit field on Emacs 22 yet.
+
 	* xdisp.c (phys_cursor_in_rect_p): Check if cursor is in fringe area.
 
 2007-12-23  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
diff --git a/src/process.c b/src/process.c
index adf8af9670d..eb0dae04e96 100644
--- a/src/process.c
+++ b/src/process.c
@@ -626,7 +626,7 @@ make_process (name)
   XSETFASTINT (p->tick, 0);
   XSETFASTINT (p->update_tick, 0);
   p->pid = 0;
-  p->pty_flag = 0;
+  p->pty_flag = Qnil;
   p->raw_status_new = 0;
   p->status = Qrun;
   p->mark = Fmake_marker ();