diff --git a/Cargo.toml b/Cargo.toml
index 26ffd0d5..bdf40ddb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,6 +22,7 @@ assertions_on_result_states = "warn"
 cloned_instead_of_copied = "warn"
 dbg_macro = "warn"
 default_union_representation = "warn"
+deref_by_slicing = "warn"
 empty_drop = "warn"
 filetype_is_file = "warn"
 float_cmp_const = "warn"
diff --git a/src/api/client_server/sync.rs b/src/api/client_server/sync.rs
index 60f54e4f..0e3cc38c 100644
--- a/src/api/client_server/sync.rs
+++ b/src/api/client_server/sync.rs
@@ -1608,7 +1608,7 @@ pub(crate) async fn sync_events_v4_route(
             })
             .take(5)
             .collect::<Vec<_>>();
-        let name = match &heroes[..] {
+        let name = match &*heroes {
             [] => None,
             [only] => Some(only.0.clone()),
             [firsts @ .., last] => Some(
@@ -1622,7 +1622,7 @@ pub(crate) async fn sync_events_v4_route(
             ),
         };
 
-        let avatar = if let [only] = &heroes[..] {
+        let avatar = if let [only] = &*heroes {
             only.1.clone()
         } else {
             None