diff --git a/lib/src/processor/memory/addresses.rs b/lib/src/processor/memory/addresses.rs
index a93f1f7..a742c1b 100644
--- a/lib/src/processor/memory/addresses.rs
+++ b/lib/src/processor/memory/addresses.rs
@@ -1,4 +1,7 @@
-use std::ops::{Add, Sub};
+use std::{
+    fmt::UpperHex,
+    ops::{Add, Sub},
+};
 
 pub(crate) use self::types::*;
 
@@ -33,6 +36,15 @@ pub(crate) enum RomAddress {
     MappedBank(MappedBankAddress),
 }
 
+impl UpperHex for RomAddress {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            RomAddress::Bank0(a) => a.fmt(f),
+            RomAddress::MappedBank(a) => a.fmt(f),
+        }
+    }
+}
+
 #[derive(Clone, Copy)]
 pub(crate) enum IoAddress {
     Joypad,