diff --git a/src/main.rs b/src/main.rs
index 67e507c..1295ea6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -217,7 +217,7 @@ async fn main() -> tide::Result<()> {
                 mode,
                 account_dir,
                 timeout,
-                local_public_ip: local_public_ip.as_ref().map(|ip| ip.as_str()),
+                local_public_ip: local_public_ip.as_deref(),
                 ..Default::default()
             };
             if let Err(e) = request_acme_certificate(acme_request) {
@@ -254,7 +254,7 @@ async fn main() -> tide::Result<()> {
                         mode,
                         account_dir,
                         timeout,
-                        local_public_ip: local_public_ip.as_ref().map(|ip| ip.as_str()),
+                        local_public_ip: local_public_ip.as_deref(),
                         cert_file: Some(format!("{}/{}", item.path, CERT_NAME)),
                         key_file: Some(format!("{}/{}", item.path, KEY_NAME)),
                     };