diff --git a/resctl-bench/src/main.rs b/resctl-bench/src/main.rs
index 3a573d2..822ae31 100644
--- a/resctl-bench/src/main.rs
+++ b/resctl-bench/src/main.rs
@@ -281,6 +281,12 @@ impl Program {
             .with_json(&request)?
             .send()?;
 
+        if response.status_code != 200 {
+            error!("Failed to submit benchmark: HTTP status code unexpected.");
+            error!("Lambda response: {:#?}", response);
+            std::process::exit(1);
+        }
+
         let response: LambdaResponse = serde_json::from_str(response.as_str()?)?;
         if response.issue.is_none() {
             if let Some(error_message) = response.error_message {