diff --git a/dnsapi/dns_ali.sh b/dnsapi/dns_ali.sh
index 352c0460..e794a19f 100644
--- a/dnsapi/dns_ali.sh
+++ b/dnsapi/dns_ali.sh
@@ -105,7 +105,7 @@ _ali_urlencode() {
 }
 
 _ali_nonce() {
-  cat /dev/urandom | _head_n 1 | _digest "sha256" hex | cut -c 1-31
+  < /dev/urandom | _head_n 1 | _digest "sha256" hex | cut -c 1-31
 }
 
 _check_exist_query() {