diff --git a/crates/buzz-relay/tests/boot_lifecycle.rs b/crates/buzz-relay/tests/boot_lifecycle.rs
index 753200b47b..ad6f20f17b 100644
--- a/crates/buzz-relay/tests/boot_lifecycle.rs
+++ b/crates/buzz-relay/tests/boot_lifecycle.rs
@@ -177,7 +177,7 @@ fn wait_for_scraped_metric(process: &mut RelayProcess, port: u16, needle: &str)
 fn wait_for_scraped_metrics(process: &mut RelayProcess, port: u16, needles: &[&str]) -> String {
     let requested = needles.join(", ");
     let mut last_scrape = String::new();
-    let mut last_error = None;
+    let mut last_error: Option<String>;
     let deadline = Instant::now() + METRICS_SCRAPE_DEADLINE;
     loop {
         assert!(