diff --git a/nucleus/src/arch/aarch64/memory/addr/asid.rs b/nucleus/src/arch/aarch64/memory/addr/asid.rs
new file mode 100644
index 0000000..ad2e4e4
--- /dev/null
+++ b/nucleus/src/arch/aarch64/memory/addr/asid.rs
@@ -0,0 +1,6 @@
+/*
+ * SPDX-License-Identifier: BlueOak-1.0.0
+ * Copyright (c) Berkus Decker <berkus+vesper@metta.systems>
+ */
+
+pub type ASID = u16;
diff --git a/nucleus/src/arch/aarch64/memory/addr/mod.rs b/nucleus/src/arch/aarch64/memory/addr/mod.rs
index bfd3b94..54076b1 100644
--- a/nucleus/src/arch/aarch64/memory/addr/mod.rs
+++ b/nucleus/src/arch/aarch64/memory/addr/mod.rs
@@ -3,8 +3,10 @@
  * Copyright (c) Berkus Decker <berkus+vesper@metta.systems>
  */
 
+mod asid;
 mod phys_addr;
 mod virt_addr;
 
+pub use asid::*;
 pub use phys_addr::*;
 pub use virt_addr::*;