diff --git a/src/backup/prune.rs b/src/backup/prune.rs
index 66c2ee84..baec57d6 100644
--- a/src/backup/prune.rs
+++ b/src/backup/prune.rs
@@ -8,7 +8,7 @@ enum PruneMark { Keep, KeepPartial, Remove }
 
 fn mark_selections<F: Fn(&BackupInfo) -> Result<String, Error>> (
     mark: &mut HashMap<PathBuf, PruneMark>,
-    list: &Vec<BackupInfo>,
+    list: &[BackupInfo],
     keep: usize,
     select_id: F,
 ) -> Result<(), Error> {
@@ -45,7 +45,7 @@ fn mark_selections<F: Fn(&BackupInfo) -> Result<String, Error>> (
 
 fn remove_incomplete_snapshots(
     mark: &mut HashMap<PathBuf, PruneMark>,
-    list: &Vec<BackupInfo>,
+    list: &[BackupInfo],
 ) {
 
     let mut keep_unfinished = true;
diff --git a/src/server/email_notifications.rs b/src/server/email_notifications.rs
index 24c15073..6af6bd38 100644
--- a/src/server/email_notifications.rs
+++ b/src/server/email_notifications.rs
@@ -376,7 +376,7 @@ fn get_server_url() -> (String, usize) {
 }
 
 pub fn send_updates_available(
-    updates: &Vec<&APTUpdateInfo>,
+    updates: &[&APTUpdateInfo],
 ) -> Result<(), Error> {
     // update mails always go to the root@pam configured email..
     if let Some(email) = lookup_user_email(Userid::root_userid()) {
diff --git a/src/tape/online_status_map.rs b/src/tape/online_status_map.rs
index e010fbcf..52042217 100644
--- a/src/tape/online_status_map.rs
+++ b/src/tape/online_status_map.rs
@@ -173,7 +173,7 @@ pub fn update_changer_online_status(
     drive_config: &SectionConfigData,
     inventory: &mut Inventory,
     changer_name: &str,
-    label_text_list: &Vec<String>,
+    label_text_list: &[String],
 ) -> Result<(), Error> {
 
     let mut online_map = OnlineStatusMap::new(drive_config)?;
diff --git a/src/tools/subscription.rs b/src/tools/subscription.rs
index 54819ea2..4d5caf39 100644
--- a/src/tools/subscription.rs
+++ b/src/tools/subscription.rs
@@ -87,8 +87,8 @@ pub struct SubscriptionInfo {
 }
 
 async fn register_subscription(
-    key: &String,
-    server_id: &String,
+    key: &str,
+    server_id: &str,
     checktime: i64
 ) -> Result<(String, String), Error> {
     // WHCMS sample code feeds the key into this, but it's just a challenge, so keep it simple