diff --git a/contrib/cron/btrbk-mail b/contrib/cron/btrbk-mail
index c1359e6..66c1658 100755
--- a/contrib/cron/btrbk-mail
+++ b/contrib/cron/btrbk-mail
@@ -4,6 +4,8 @@
 
 now=$(date +%Y%m%d)
 
+declare -A rsync_src rsync_dst rsync_log rsync_rsh rsync_opt
+
 #####  start config section  #####
 
 # Email recipients, separated by whitespace: