diff --git a/emulator/core/src/devices.rs b/emulator/core/src/devices.rs
index 2a66e07..71a2a29 100644
--- a/emulator/core/src/devices.rs
+++ b/emulator/core/src/devices.rs
@@ -1,4 +1,4 @@
-use std::any::{type_name, type_name_of_val, Any, TypeId};
+use std::any::{type_name, Any, TypeId};
 use std::ops::Deref;
 use std::rc::Rc;
 use std::cell::RefCell;
@@ -234,12 +234,6 @@ pub fn downcast_rc_refc<'a, T: DynDevice>(field: &'a Device) -> Result<&'a Rc<Re
     }
 }
 
-pub type TransmutableBox = Rc<RefCell<Box<dyn Transmutable>>>;
-
-pub fn wrap_transmutable<T: Transmutable + 'static>(value: T) -> TransmutableBox {
-    Rc::new(RefCell::new(Box::new(value)))
-}
-
 static NEXT_ID: AtomicU32 = AtomicU32::new(1);
 
 pub fn get_next_device_id() -> u32 {
diff --git a/emulator/core/src/lib.rs b/emulator/core/src/lib.rs
index 26dc8c8..a33600c 100644
--- a/emulator/core/src/lib.rs
+++ b/emulator/core/src/lib.rs
@@ -7,10 +7,10 @@ mod memory;
 mod system;
 
 pub use crate::devices::{
-    Address, Addressable, Steppable, Interruptable, Debuggable, Inspectable, Transmutable, TransmutableBox, DynDevice, Device,
+    Address, Addressable, Steppable, Interruptable, Debuggable, Inspectable, Transmutable, DynDevice, Device,
 };
 pub use crate::devices::{
-    read_beu16, read_beu32, read_leu16, read_leu32, write_beu16, write_beu32, write_leu16, write_leu32, wrap_transmutable, wrap_device
+    read_beu16, read_beu32, read_leu16, read_leu32, write_beu16, write_beu32, write_leu16, write_leu32, wrap_device
 };
 pub use crate::error::Error;
 pub use crate::interrupts::InterruptController;