diff --git a/src/cache.rs b/src/cache.rs
index 02db660..fc2ef4a 100644
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -187,8 +187,8 @@ impl CalDavSource<CachedCalendar> for Cache {
         )
     }
 
-    async fn get_calendar(&self, id: CalendarId) -> Option<Arc<Mutex<CachedCalendar>>> {
-        self.data.calendars.get(&id).map(|arc| arc.clone())
+    async fn get_calendar(&self, id: &CalendarId) -> Option<Arc<Mutex<CachedCalendar>>> {
+        self.data.calendars.get(id).map(|arc| arc.clone())
     }
 }
 
diff --git a/src/client.rs b/src/client.rs
index ae110f7..1dee51d 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -220,11 +220,11 @@ impl CalDavSource<RemoteCalendar> for Client {
     }
 
 
-    async fn get_calendar(&self, id: CalendarId) -> Option<Arc<Mutex<RemoteCalendar>>> {
+    async fn get_calendar(&self, id: &CalendarId) -> Option<Arc<Mutex<RemoteCalendar>>> {
         self.cached_replies.lock().unwrap()
             .calendars
             .as_ref()
-            .and_then(|cals| cals.get(&id))
+            .and_then(|cals| cals.get(id))
             .map(|cal| cal.clone())
         }
 }
diff --git a/src/provider.rs b/src/provider.rs
index 3fcbdcc..bcedd1d 100644
--- a/src/provider.rs
+++ b/src/provider.rs
@@ -68,7 +68,7 @@ where
         for (id, cal_server) in cals_server {
             let mut cal_server = cal_server.lock().unwrap();
 
-            let cal_local = match self.local.get_calendar(id).await {
+            let cal_local = match self.local.get_calendar(&id).await {
                 None => {
                     log::error!("TODO: implement here");
                     continue;
diff --git a/src/traits.rs b/src/traits.rs
index 674f0b8..9c5c9d6 100644
--- a/src/traits.rs
+++ b/src/traits.rs
@@ -15,7 +15,7 @@ pub trait CalDavSource<T: PartialCalendar> {
     /// This function may trigger an update (that can be a long process, or that can even fail, e.g. in case of a remote server)
     async fn get_calendars(&self) -> Result<HashMap<CalendarId, Arc<Mutex<T>>>, Box<dyn Error>>;
     /// Returns the calendar matching the ID
-    async fn get_calendar(&self, id: CalendarId) -> Option<Arc<Mutex<T>>>;
+    async fn get_calendar(&self, id: &CalendarId) -> Option<Arc<Mutex<T>>>;
 }
 
 pub trait SyncSlave {
diff --git a/tests/sync.rs b/tests/sync.rs
index ba0ea02..1c44fe7 100644
--- a/tests/sync.rs
+++ b/tests/sync.rs
@@ -104,7 +104,7 @@ async fn populate_test_provider() -> Provider<Cache, CachedCalendar, Cache, Cach
 
     // Step 2
     // Edit the server calendar
-    let cal_server = server.get_calendar(cal_id.clone()).await.unwrap();
+    let cal_server = server.get_calendar(&cal_id).await.unwrap();
     let mut cal_server = cal_server.lock().unwrap();
 
     cal_server.delete_item(&task_b_id).await.unwrap();
@@ -134,7 +134,7 @@ async fn populate_test_provider() -> Provider<Cache, CachedCalendar, Cache, Cach
 
     // Step 3
     // Edit the local calendar
-    let cal_local = local.get_calendar(cal_id).await.unwrap();
+    let cal_local = local.get_calendar(&cal_id).await.unwrap();
     let mut cal_local = cal_local.lock().unwrap();
 
     cal_local.delete_item(&task_c_id).await.unwrap();