diff --git a/src/auth.rs b/src/auth.rs
index da3fac3..a16cc27 100644
--- a/src/auth.rs
+++ b/src/auth.rs
@@ -5,7 +5,7 @@ use std::sync::Arc;
 use tokio::sync::Mutex;
 use tracing::instrument;
 
-use crate::db::SqliteDatabase;
+use crate::db::{Database, SqliteDatabase};
 #[derive(Debug, Clone, Deserialize)]
 pub struct Password(pub SecretString);
 
@@ -13,11 +13,11 @@ pub struct Password(pub SecretString);
 pub struct UserToken(pub SecretString);
 
 #[derive(Debug)]
-pub struct Authenticator {
-    db: Arc<Mutex<SqliteDatabase>>,
+pub struct Authenticator<DB: Database> {
+    db: Arc<Mutex<DB>>,
 }
 
-impl Authenticator {
+impl Authenticator<SqliteDatabase> {
     pub fn new(db: Arc<Mutex<SqliteDatabase>>) -> Self {
         Self { db }
     }