diff --git a/src/processor/memory/rom/mbcs.rs b/src/processor/memory/rom/mbcs.rs
index 6ccbe4c..cc0af68 100644
--- a/src/processor/memory/rom/mbcs.rs
+++ b/src/processor/memory/rom/mbcs.rs
@@ -12,9 +12,3 @@ pub(super) trait Mbc {
     fn set_ram(&mut self, address: Address, data: u8);
     fn mbc_type(&self) -> String;
 }
-
-#[derive(Clone, Copy)]
-enum BankingMode {
-    Simple,
-    Advanced,
-}
diff --git a/src/processor/memory/rom/mbcs/mbc1.rs b/src/processor/memory/rom/mbcs/mbc1.rs
index dd6051b..4f9387a 100644
--- a/src/processor/memory/rom/mbcs/mbc1.rs
+++ b/src/processor/memory/rom/mbcs/mbc1.rs
@@ -1,8 +1,14 @@
-use super::{BankingMode, Mbc};
+use super::Mbc;
 use crate::processor::memory::Address;
 
+#[derive(Clone, Copy)]
+enum BankingMode {
+    Simple,
+    Advanced,
+}
+
 pub struct Mbc1 {
-    pub data: Vec<u8>,
+    data: Vec<u8>,
     rom_len: usize,
     rom_bank: u8,
     ram_enabled: bool,
diff --git a/src/processor/memory/rom/mbcs/none.rs b/src/processor/memory/rom/mbcs/none.rs
index 1d232b3..246b817 100644
--- a/src/processor/memory/rom/mbcs/none.rs
+++ b/src/processor/memory/rom/mbcs/none.rs
@@ -2,7 +2,7 @@ use super::Mbc;
 use crate::processor::memory::Address;
 
 pub struct None {
-    pub(super) data: Vec<u8>,
+    data: Vec<u8>,
 }
 
 impl None {