diff -urN frotz-2.40.old/screen.c frotz-2.40/screen.c
--- frotz-2.40.old/screen.c	Sat Oct 21 15:08:20 2000
+++ frotz-2.40/screen.c	Fri Mar  9 22:54:44 2001
@@ -1563,7 +1563,7 @@
 
     spaces = units_left () / os_char_width (' ') - column;
 
-    while (spaces--)
+    while (spaces-- > 0)
 	screen_char (' ');
 
 }/* pad_status_line */