diff --git a/feeder-plugin/book-feeder/src/openlibrary_client.rs b/feeder-plugin/book-feeder/src/openlibrary_client.rs
index 74c10a2..842f3fa 100644
--- a/feeder-plugin/book-feeder/src/openlibrary_client.rs
+++ b/feeder-plugin/book-feeder/src/openlibrary_client.rs
@@ -769,7 +769,7 @@ fn etext_of(body: &Value, gutenberg_id: u64) -> Etext {
 pub fn main_title(raw: &str) -> String {
     let lower = raw.to_lowercase();
     let head = lower
-        .split(|c: char| matches!(c, ';' | ':' | '(' | '['))
+        .split([';', ':', '(', '['])
         .next()
         .unwrap_or_default();
     let head = head.find(", or").map_or(head, |i| &head[..i]);