diff -wpruN --no-dereference '--exclude=*.orig' a~/src/util/dict_dbm.c a/src/util/dict_dbm.c
--- a~/src/util/dict_dbm.c	1970-01-01 00:00:00
+++ a/src/util/dict_dbm.c	1970-01-01 00:00:00
@@ -472,7 +472,7 @@ DICT   *dict_dbm_open(const char *path,
 	msg_fatal("open database %s: cannot support GDBM", path);
     if (fstat(dict_dbm->dict.stat_fd, &st) < 0)
 	msg_fatal("dict_dbm_open: fstat: %m");
-    if (open_mode == O_RDONLY)
+    if (open_flags == O_RDONLY)
 	dict_dbm->dict.mtime = st.st_mtime;
     dict_dbm->dict.owner.uid = st.st_uid;
     dict_dbm->dict.owner.status = (st.st_uid != 0);