diff --git a/bindings/r/src/rust/src/io.rs b/bindings/r/src/rust/src/io.rs
new file mode 100644
index 0000000..13d4c73
--- /dev/null
+++ b/bindings/r/src/rust/src/io.rs
@@ -0,0 +1,30 @@
+use extendr_api::prelude::*;
+
+use gtars::io::{read_tokens_from_gtok, write_tokens_to_gtok};
+
+/// Write tokens to a gtok file
+/// @export
+/// @param filename A string representing the path to the gtok file.
+#[extendr(r_name = "write_tokens_to_gtok")]
+pub fn r_write_tokens_to_gtok(filename: String, tokens: Vec<i32>) {
+    let tokens: Vec<u32> = tokens.into_iter().map(|t| t as u32).collect();
+    let _ = write_tokens_to_gtok(&filename, &tokens);
+}
+
+/// Write tokens to a gtok file
+/// @export
+/// @param filename A string representing the path to the gtok file.
+#[extendr(r_name = "read_tokens_from_gtok")]
+pub fn r_read_tokens_from_gtok(filename: String) -> Vec<i32> {
+    read_tokens_from_gtok(&filename)
+        .unwrap()
+        .into_iter()
+        .map(|gtok| gtok as i32)
+        .collect()
+}
+
+extendr_module! {
+    mod io;
+    fn r_read_tokens_from_gtok;
+    fn r_write_tokens_to_gtok;
+}
\ No newline at end of file
diff --git a/bindings/r/src/rust/src/lib.rs b/bindings/r/src/rust/src/lib.rs
index 2498955..77c03bc 100644
--- a/bindings/r/src/rust/src/lib.rs
+++ b/bindings/r/src/rust/src/lib.rs
@@ -1,41 +1,11 @@
 use extendr_api::prelude::*;
 
-use gtars::io::{read_tokens_from_gtok, write_tokens_to_gtok};
-
-/// Return string `"Hello world!"` to R.
-/// @export
-#[extendr]
-fn hello_world() -> &'static str {
-    "Hello world!"
-}
-
-/// Write tokens to a gtok file
-/// @export
-/// @param filename A string representing the path to the gtok file.
-#[extendr(r_name = "write_tokens_to_gtok")]
-fn r_write_tokens_to_gtok(filename: String, tokens: Vec<i32>) {
-    let tokens: Vec<u32> = tokens.into_iter().map(|t| t as u32).collect();
-    let _ = write_tokens_to_gtok(&filename, &tokens);
-}
-
-/// Write tokens to a gtok file
-/// @export
-/// @param filename A string representing the path to the gtok file.
-#[extendr(r_name = "read_tokens_from_gtok")]
-fn r_read_tokens_from_gtok(filename: String) -> Vec<i32> {
-    read_tokens_from_gtok(&filename)
-        .unwrap()
-        .into_iter()
-        .map(|gtok| gtok as i32)
-        .collect()
-}
+pub mod io;
 
 // Macro to generate exports.
 // This ensures exported functions are registered with R.
 // See corresponding C code in `entrypoint.c`.
 extendr_module! {
     mod gtars;
-    fn hello_world;
-    fn r_write_tokens_to_gtok;
-    fn r_read_tokens_from_gtok;
+    use io;
 }