diff --git a/lighthouse/src/main.rs b/lighthouse/src/main.rs
index b98e8e8336..c92f595550 100644
--- a/lighthouse/src/main.rs
+++ b/lighthouse/src/main.rs
@@ -232,5 +232,5 @@ fn run<E: EthSpec>(
     drop(validator_client);
 
     // Shutdown the environment once all tasks have completed.
-    environment.shutdown_on_idle()
+    Ok(environment.shutdown_on_idle())
 }