diff --git a/tests/custom_build_name.rs b/tests/custom_build_name.rs
index faf11d3..d54fb3b 100644
--- a/tests/custom_build_name.rs
+++ b/tests/custom_build_name.rs
@@ -18,7 +18,11 @@ fn custom_build_name() {
     assert!(!output.status.success());
 
     let stderr = std::str::from_utf8(&output.stderr).unwrap();
-    assert!(stderr.contains("ping: => missing cap_net_raw+p capability or setuid?"));
+    assert!(
+        stderr.contains("ping: => missing cap_net_raw+p capability or setuid?"),
+        "stderr does not contain expected string:\n```\n{}\n```",
+        stderr
+    );
 }
 
 #[allow(clippy::disallowed_methods)]