diff --git a/crates/lanparty-client-win/src/main.rs b/crates/lanparty-client-win/src/main.rs
index 970f55b..b564c72 100644
--- a/crates/lanparty-client-win/src/main.rs
+++ b/crates/lanparty-client-win/src/main.rs
@@ -35,6 +35,8 @@ const TAP_INTERFACE_METRIC: u32 = 9_000;
 const RELAY_ROUTE_VERIFY_INTERVAL: Duration = Duration::from_secs(5);
 #[cfg(windows)]
 const CLIENT_DIAGNOSTICS_INTERVAL: Duration = Duration::from_secs(10);
+const MAX_CLIENT_SHUTDOWN_MESSAGE_BYTES: usize = 1024;
+const CLIENT_SHUTDOWN_TRUNCATION_SUFFIX: &str = "...";
 
 #[derive(Debug, Parser)]
 #[command(
@@ -221,10 +223,28 @@ async fn main() -> Result<()> {
 }
 
 fn client_shutdown_message(run_result: &Result<()>) -> String {
-    match run_result {
+    let message = match run_result {
         Ok(()) => "client shutting down".to_owned(),
         Err(error) => format!("client shutting down after error: {error:#}"),
+    };
+
+    truncate_client_shutdown_message(&message)
+}
+
+fn truncate_client_shutdown_message(message: &str) -> String {
+    if message.len() <= MAX_CLIENT_SHUTDOWN_MESSAGE_BYTES {
+        return message.to_owned();
     }
+
+    let suffix_len = CLIENT_SHUTDOWN_TRUNCATION_SUFFIX.len();
+    let mut end = MAX_CLIENT_SHUTDOWN_MESSAGE_BYTES - suffix_len;
+    while !message.is_char_boundary(end) {
+        end -= 1;
+    }
+
+    let mut truncated = message[..end].to_owned();
+    truncated.push_str(CLIENT_SHUTDOWN_TRUNCATION_SUFFIX);
+    truncated
 }
 
 #[cfg(windows)]
@@ -1296,6 +1316,18 @@ mod tests {
         );
     }
 
+    #[test]
+    fn bounds_runtime_errors_in_shutdown_message() {
+        let detail = "x".repeat(MAX_CLIENT_SHUTDOWN_MESSAGE_BYTES * 2);
+        let error = anyhow::anyhow!("{detail}").context("bridge stopped");
+
+        let message = client_shutdown_message(&Err(error));
+
+        assert_eq!(message.len(), MAX_CLIENT_SHUTDOWN_MESSAGE_BYTES);
+        assert!(message.starts_with("client shutting down after error: bridge stopped: "));
+        assert!(message.ends_with(CLIENT_SHUTDOWN_TRUNCATION_SUFFIX));
+    }
+
     #[test]
     fn formats_client_diagnostics_status_line() {
         let diagnostics = ClientDiagnostics::new(