diff --git a/g3proxy/src/escape/mod.rs b/g3proxy/src/escape/mod.rs
index 0808b59a..23385369 100644
--- a/g3proxy/src/escape/mod.rs
+++ b/g3proxy/src/escape/mod.rs
@@ -138,6 +138,7 @@ pub(crate) trait EscaperInternal {
 #[async_trait]
 pub(crate) trait Escaper: EscaperInternal {
     fn name(&self) -> &MetricsName;
+    #[allow(unused)]
     fn escaper_type(&self) -> &str;
     fn get_escape_stats(&self) -> Option<ArcEscaperStats> {
         None
diff --git a/g3proxy/src/serve/http_proxy/task/ftp/list.rs b/g3proxy/src/serve/http_proxy/task/ftp/list.rs
index 4c8f8781..e9fdf1ae 100644
--- a/g3proxy/src/serve/http_proxy/task/ftp/list.rs
+++ b/g3proxy/src/serve/http_proxy/task/ftp/list.rs
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-use std::io::{self, Error, Write};
+use std::io::{self, Write};
 
 use tokio::io::{AsyncWrite, AsyncWriteExt, BufWriter};
 
@@ -26,8 +26,11 @@ const CHUNKED_BUF_TAIL_RESERVED: usize = 2;
 pub(super) trait ListWriter: FtpLineDataReceiver {
     fn take_io_error(&mut self) -> Option<io::Error>;
     async fn flush_buf(&mut self) -> io::Result<()>;
+    #[allow(unused)]
     fn is_idle(&self) -> bool;
+    #[allow(unused)]
     fn reset_active(&mut self);
+    #[allow(unused)]
     fn no_cached_data(&self) -> bool;
 }
 
@@ -102,7 +105,7 @@ where
     W: AsyncWrite + Send + Unpin,
 {
     #[inline]
-    fn take_io_error(&mut self) -> Option<Error> {
+    fn take_io_error(&mut self) -> Option<io::Error> {
         self.io_error.take()
     }
 
diff --git a/g3tiles/src/config/backend/mod.rs b/g3tiles/src/config/backend/mod.rs
index deb18529..90419892 100644
--- a/g3tiles/src/config/backend/mod.rs
+++ b/g3tiles/src/config/backend/mod.rs
@@ -42,6 +42,7 @@ pub(crate) enum BackendConfigDiffAction {
 pub(crate) trait BackendConfig {
     fn name(&self) -> &MetricsName;
     fn position(&self) -> Option<YamlDocPosition>;
+    #[allow(unused)]
     fn backend_type(&self) -> &'static str;
 
     fn diff_action(&self, new: &AnyBackendConfig) -> BackendConfigDiffAction;
diff --git a/g3tiles/src/config/discover/mod.rs b/g3tiles/src/config/discover/mod.rs
index 06df4314..cc6eaccd 100644
--- a/g3tiles/src/config/discover/mod.rs
+++ b/g3tiles/src/config/discover/mod.rs
@@ -49,6 +49,7 @@ pub(crate) enum DiscoverConfigDiffAction {
 pub(crate) trait DiscoverConfig {
     fn name(&self) -> &MetricsName;
     fn position(&self) -> Option<YamlDocPosition>;
+    #[allow(unused)]
     fn discover_type(&self) -> &'static str;
 
     fn diff_action(&self, new: &AnyDiscoverConfig) -> DiscoverConfigDiffAction;