diff --git a/boring-sys/src/lib.rs b/boring-sys/src/lib.rs
index da297649..4c783232 100644
--- a/boring-sys/src/lib.rs
+++ b/boring-sys/src/lib.rs
@@ -3,6 +3,7 @@
     clippy::redundant_static_lifetimes,
     clippy::too_many_arguments,
     clippy::unreadable_literal,
+    clippy::upper_case_acronyms,
     improper_ctypes,
     non_camel_case_types,
     non_snake_case,
diff --git a/boring/src/ssl/bio.rs b/boring/src/ssl/bio.rs
index bef906f9..9d02fc00 100644
--- a/boring/src/ssl/bio.rs
+++ b/boring/src/ssl/bio.rs
@@ -213,7 +213,7 @@ use ffi::{BIO_get_data, BIO_set_data, BIO_set_flags, BIO_set_init};
 #[allow(bad_style)]
 unsafe fn BIO_set_num(_bio: *mut ffi::BIO, _num: c_int) {}
 
-#[allow(bad_style)]
+#[allow(bad_style, clippy::upper_case_acronyms)]
 struct BIO_METHOD(*mut ffi::BIO_METHOD);
 
 impl BIO_METHOD {
diff --git a/tokio-boring/src/lib.rs b/tokio-boring/src/lib.rs
index 1ed5c25a..35b9dac9 100644
--- a/tokio-boring/src/lib.rs
+++ b/tokio-boring/src/lib.rs
@@ -292,6 +292,14 @@ impl<S> HandshakeError<S> {
             _ => None,
         }
     }
+
+    /// Returns a reference to the inner I/O error, if any.
+    pub fn as_io_error(&self) -> Option<&io::Error> {
+        match &self.0 {
+            ssl::HandshakeError::Failure(s) => s.error().io_error(),
+            _ => None,
+        }
+    }
 }
 
 impl<S> fmt::Debug for HandshakeError<S>