Index: src/ex_cmds.c
===================================================================
--- src/ex_cmds.c (revision 57778)
+++ src/ex_cmds.c (working copy)
@@ -4069,7 +4069,7 @@
if (eap->forceit)
bigness = curwin->w_height;
else if (firstwin == lastwin)
- bigness = curwin->w_p_scr * 2;
+ bigness = p_window_unix2003 ? p_window_unix2003 : curwin->w_p_scr * 2;
#ifdef FEAT_WINDOWS
else
bigness = curwin->w_height - 3;