diff --git a/src/login/static_provider.rs b/src/login/static_provider.rs
index 76ad6a6..b11123c 100644
--- a/src/login/static_provider.rs
+++ b/src/login/static_provider.rs
@@ -24,7 +24,7 @@ pub struct UserDatabase {
 
 pub struct StaticLoginProvider {
     user_db: watch::Receiver<UserDatabase>,
-    in_memory_store: tokio::sync::Mutex<HashMap<String, Arc<storage::in_memory::MemBuilder>>>,
+    in_memory_store: storage::in_memory::MemDb,
 }
 
 pub async fn update_user_list(config: PathBuf, up: watch::Sender<UserDatabase>) -> Result<()> {
@@ -71,7 +71,7 @@ impl StaticLoginProvider {
         tokio::spawn(update_user_list(config.user_list, tx));
         rx.changed().await?;
 
-        Ok(Self { user_db: rx, in_memory_store: tokio::sync::Mutex::new(HashMap::new()) })
+        Ok(Self { user_db: rx, in_memory_store: storage::in_memory::MemDb::new() })
     }
 }
 
@@ -94,13 +94,7 @@ impl LoginProvider for StaticLoginProvider {
 
         tracing::debug!(user=%username, "fetch keys");
         let storage: storage::Builder = match &user.config.storage {
-            StaticStorage::InMemory => {
-                let mut global_storage = self.in_memory_store.lock().await;
-                global_storage
-                    .entry(username.to_string())
-                    .or_insert(storage::in_memory::MemBuilder::new(username))
-                    .clone()
-            },
+            StaticStorage::InMemory => self.in_memory_store.builder(username).await,
             StaticStorage::Garage(grgconf) => storage::garage::GarageBuilder::new(storage::garage::GarageConf {
                 region: grgconf.aws_region.clone(),
                 k2v_endpoint: grgconf.k2v_endpoint.clone(),
@@ -129,13 +123,7 @@ impl LoginProvider for StaticLoginProvider {
         tracing::debug!(user=%user.username, "public_login");
 
         let storage: storage::Builder = match &user.config.storage {
-            StaticStorage::InMemory => {
-                let mut global_storage = self.in_memory_store.lock().await;
-                global_storage
-                    .entry(user.username.to_string())
-                    .or_insert(storage::in_memory::MemBuilder::new(&user.username))
-                    .clone()
-            },
+            StaticStorage::InMemory => self.in_memory_store.builder(&user.username).await,
             StaticStorage::Garage(grgconf) => storage::garage::GarageBuilder::new(storage::garage::GarageConf {
                 region: grgconf.aws_region.clone(),
                 k2v_endpoint: grgconf.k2v_endpoint.clone(),
diff --git a/src/storage/in_memory.rs b/src/storage/in_memory.rs
index 00eedab..fb6e599 100644
--- a/src/storage/in_memory.rs
+++ b/src/storage/in_memory.rs
@@ -9,6 +9,22 @@ use tokio::sync::Notify;
 /// It means that when a user disconnects, its data are lost.
 /// It's intended only for basic debugging, do not use it for advanced tests...
 
+#[derive(Debug, Default)]
+pub struct MemDb(tokio::sync::Mutex<HashMap<String, Arc<MemBuilder>>>);
+impl MemDb {
+    pub fn new() -> Self {
+        Self(tokio::sync::Mutex::new(HashMap::new()))
+    }
+
+    pub async fn builder(&self, username: &str) ->  Arc<MemBuilder> {
+        let mut global_storage = self.0.lock().await;
+        global_storage
+            .entry(username.to_string())
+            .or_insert(MemBuilder::new(username))
+            .clone()
+    }
+}
+
 #[derive(Debug, Clone)]
 enum InternalData {
     Tombstone,