From: Santiago Vila <sanvila@debian.org>
Subject: Patch from procmail 3.15

--- a/src/foldinfo.h
+++ b/src/foldinfo.h
@@ -10,7 +10,7 @@
 
 #define ft_lock(type)	   ((type)>ft_MAILDIR)
 #define ft_atime(type)	   ((type)==ft_FILE)	      /* force atime < mtime */
-#define ft_dotlock(type)   ((type)==ft_FILE)
+#define ft_dotlock(type)   ((type)>ft_MAILDIR)
 #define ft_delim(type)	   ((type)==ft_FILE)
 #define ft_checkcloser(type) ((type)>ft_MH)
 
