diff --git a/rsync-backup/resources/bin/mirror-dir b/rsync-backup/resources/bin/mirror-dir
index 7ffb44c..c8be43d 100755
--- a/rsync-backup/resources/bin/mirror-dir
+++ b/rsync-backup/resources/bin/mirror-dir
@@ -77,7 +77,7 @@ mirror-dir:run() {
     mkdir -p "$state_dir"
     rsync_options=(
         ${RSYNC_OPTIONS:-} --stats --out-format='%i %o %f %l %b')
-    ssh_options=(${SSH_OPTIONS:-})
+    ssh_options=(${SSH_OPTIONS:--o StrictHostKeyChecking=no})
 
     for dest in "${dests[@]}"; do
         dest_rsync_options=("${rsync_options[@]}")