diff --git a/crates/webhook/src/lib.rs b/crates/webhook/src/lib.rs
index d89e9de..00f1be2 100644
--- a/crates/webhook/src/lib.rs
+++ b/crates/webhook/src/lib.rs
@@ -240,7 +240,7 @@ impl WebhookInfo {
             attempt_count: header_u32(headers, "X-Hookdeck-Attempt-Count"),
             attempt_trigger: header_string(headers, "X-Hookdeck-Attempt-Trigger"),
             will_retry_after: header_string(headers, "X-Hookdeck-Will-Retry-After")
-                .filter(|v| v.to_ascii_lowercase() != "empty"),
+                .filter(|v| !v.eq_ignore_ascii_case("empty")),
         };
 
         Self {