diff --git a/rama-http-backend/src/client/proxy/layer/proxy_connector/service.rs b/rama-http-backend/src/client/proxy/layer/proxy_connector/service.rs
index 61f5442f..854ff371 100644
--- a/rama-http-backend/src/client/proxy/layer/proxy_connector/service.rs
+++ b/rama-http-backend/src/client/proxy/layer/proxy_connector/service.rs
@@ -122,13 +122,12 @@ where
                 .await
                 .map_err(|err| match address.as_ref() {
                     Some(address) => OpaqueError::from_std(HttpProxyError::Transport(
-                        OpaqueError::from_display(format!(
-                            "establish connection to proxy {} (protocol: {:?}): {}",
-                            address.authority,
-                            address.protocol,
-                            err.into(),
-                        ))
-                        .into_boxed(),
+                        OpaqueError::from_boxed(err.into())
+                            .context(format!(
+                                "establish connection to proxy {} (protocol: {:?})",
+                                address.authority, address.protocol,
+                            ))
+                            .into_boxed(),
                     )),
                     None => {
                         OpaqueError::from_boxed(err.into()).context("establish connection target")