diff --git a/meilisearch-core/src/update/settings_update.rs b/meilisearch-core/src/update/settings_update.rs
index 7bb84c866..e96d5702c 100644
--- a/meilisearch-core/src/update/settings_update.rs
+++ b/meilisearch-core/src/update/settings_update.rs
@@ -296,7 +296,7 @@ pub fn apply_synonyms_update(
     fn normalize<T: AsRef<[u8]>>(analyzer: &Analyzer<T>, text: &str) -> String {
         analyzer.analyze(&text)
             .tokens()
-            .fold(String::new(), |mut s, t| s + t.text())
+            .fold(String::new(), |s, t| s + t.text())
     }
 
     let mut synonyms_builder = SetBuilder::memory();