diff --git a/resctl-bench/src/main.rs b/resctl-bench/src/main.rs
index 2ff3a5d..3a573d2 100644
--- a/resctl-bench/src/main.rs
+++ b/resctl-bench/src/main.rs
@@ -286,7 +286,8 @@ impl Program {
             if let Some(error_message) = response.error_message {
                 error!("Failed to submit benchmark: {}", error_message);
             } else {
-                error!("Submission failed for an unknown reason...");
+                error!("Failed to submit benchmark: Unknown reason.");
+                error!("Lambda response: {:#?}", response);
             }
             std::process::exit(1);
         }