diff --git a/lib_acl/src/net/acl_vstream_net.c b/lib_acl/src/net/acl_vstream_net.c
index 3bda78e8e..2504f470f 100644
--- a/lib_acl/src/net/acl_vstream_net.c
+++ b/lib_acl/src/net/acl_vstream_net.c
@@ -196,12 +196,13 @@ ACL_VSTREAM *acl_vstream_timed_connect(const char *addr, int block_mode,
 	}
 
 	client = acl_vstream_fdopen(connfd, ACL_VSTREAM_FLAG_RW,
-		    rw_bufsize, rw_timeout / 1000, ACL_VSTREAM_TYPE_SOCK);
+		    rw_bufsize, rw_timeout, ACL_VSTREAM_TYPE_SOCK);
 	if (client == NULL) {
 		acl_socket_close(connfd);
 		return NULL;
 	}
 
+	/* must set the IO timeout in ms unit */
 	ACL_VSTREAM_SET_MS(client);
 
 	family = acl_getsockfamily(connfd);