diff --git a/crates/rsjudge-runner/src/lib.rs b/crates/rsjudge-runner/src/lib.rs
index 3bc02d3..8bc4f8f 100644
--- a/crates/rsjudge-runner/src/lib.rs
+++ b/crates/rsjudge-runner/src/lib.rs
@@ -13,7 +13,11 @@ pub use crate::{
 
 mod caps_check;
 mod error;
+
+#[macro_use]
+mod user_macro;
 pub mod user;
+
 pub trait RunAs {
     type Error;
     fn run_as(&mut self, user: &User) -> Result<&mut Self>;
diff --git a/crates/rsjudge-runner/src/user.rs b/crates/rsjudge-runner/src/user.rs
index 1c3c9de..da2899e 100644
--- a/crates/rsjudge-runner/src/user.rs
+++ b/crates/rsjudge-runner/src/user.rs
@@ -6,26 +6,11 @@ use std::sync::OnceLock;
 
 use uzers::{get_user_by_name, User};
 
-use crate::error::{Error, Result};
-
-/// Generate functions to get user instances.
-macro_rules! users {
-    ($($vis:vis fn $id:ident() => $name:literal);* $(;)?) => {
-        $(
-            #[doc = concat!("Get an instance of user `", $name, "`.")]
-            ///
-            /// # Errors
-            /// Returns an error if the user is not found.
-            pub fn $id() -> Result<&'static User> {
-                static INNER: OnceLock<Option<User>> = OnceLock::new();
-                INNER
-                    .get_or_init(|| get_user_by_name($name))
-                    .as_ref()
-                    .ok_or_else(|| Error::UserNotFound { username: $name })
-            }
-        )*
-    };
-}
+use crate::{
+    error::{Error, Result},
+    // #[macro_use]
+    // user_macro::users,
+};
 
 users! {
     pub fn supervisor() => "rsjudge-supervisor";
diff --git a/crates/rsjudge-runner/src/user_macro.rs b/crates/rsjudge-runner/src/user_macro.rs
new file mode 100644
index 0000000..be3cfd5
--- /dev/null
+++ b/crates/rsjudge-runner/src/user_macro.rs
@@ -0,0 +1,18 @@
+/// Generate functions to get user instances.
+macro_rules! users {
+    ($($vis:vis fn $id:ident() => $name:literal);* $(;)?) => {
+        $(
+            #[doc = concat!("Get an instance of user `", $name, "`.")]
+            ///
+            /// # Errors
+            /// Returns an error if the user is not found.
+            pub fn $id() -> Result<&'static User> {
+                static INNER: OnceLock<Option<User>> = OnceLock::new();
+                INNER
+                    .get_or_init(|| get_user_by_name($name))
+                    .as_ref()
+                    .ok_or_else(|| Error::UserNotFound { username: $name })
+            }
+        )*
+    };
+}