diff --git a/snocat/src/util/mapped_owned_async_mutex.rs b/snocat/src/util/mapped_owned_async_mutex.rs
deleted file mode 100644
index 8af54ec..0000000
--- a/snocat/src/util/mapped_owned_async_mutex.rs
+++ /dev/null
@@ -1,48 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT license OR Apache 2.0
-use tokio::sync::{Mutex, OwnedMutexGuard};
-
-pub struct MappedOwnedMutexGuard<U, T> {
-  mutex: OwnedMutexGuard<U>,
-  mapper: Box<dyn (for<'a> Fn(&'a U) -> &'a T) + Send + 'static>,
-}
-
-impl<U, T> MappedOwnedMutexGuard<U, T> {
-  pub fn new<FMap: (for<'a> Fn(&'a U) -> &'a T) + Send + 'static>(
-    item: OwnedMutexGuard<U>,
-    map: FMap,
-  ) -> Self {
-    Self {
-      mutex: item,
-      mapper: Box::new(map),
-    }
-  }
-
-  fn map(&self) -> &T {
-    (self.mapper)(&*self.mutex)
-  }
-
-  fn map_mut(&mut self) -> &mut T {
-    let immutable_ref = self.map();
-    // We're mutable on the outside, so we're safe to make mutable on the inside
-    #[allow(mutable_transmutes)]
-    let mutable_unsafe_ref = unsafe { std::mem::transmute::<&T, &mut T>(immutable_ref) };
-    mutable_unsafe_ref
-  }
-
-  pub fn extract(self) -> OwnedMutexGuard<U> {
-    self.mutex
-  }
-}
-
-impl<U, T> AsRef<T> for MappedOwnedMutexGuard<U, T> {
-  fn as_ref(&self) -> &T {
-    self.map()
-  }
-}
-
-impl<U, T> AsMut<T> for MappedOwnedMutexGuard<U, T> {
-  fn as_mut(&mut self) -> &mut T {
-    self.map_mut()
-  }
-}
diff --git a/snocat/src/util/mod.rs b/snocat/src/util/mod.rs
index e66242b..bfe44d7 100644
--- a/snocat/src/util/mod.rs
+++ b/snocat/src/util/mod.rs
@@ -20,12 +20,10 @@ use tokio::net::TcpStream;
 pub mod cancellation;
 pub mod dropkick;
 pub mod framed;
-mod mapped_owned_async_mutex;
 pub(crate) mod merge_streams;
 pub mod tunnel_stream;
 pub mod validators;
 pub(crate) mod vtdroppable;
-pub use mapped_owned_async_mutex::MappedOwnedMutexGuard;
 
 // HTTP protocol constant from quinn/examples/common
 pub const ALPN_QUIC_HTTP: &[&[u8]] = &[b"hq-29"];