diff --git a/hercules_opt/src/pass.rs b/hercules_opt/src/pass.rs
index 8161716984913a53d0942ba7bc9c5975403583e9..cb56f709dcc632159a6d4ce61d77f6055413918e 100644
--- a/hercules_opt/src/pass.rs
+++ b/hercules_opt/src/pass.rs
@@ -676,7 +676,7 @@ impl PassManager {
                         .stdin(Stdio::piped())
                         .stdout(Stdio::piped())
                         .spawn()
-                        .unwrap();
+                        .expect("Error running clang. Is it installed?");
                     assert!(clang_process.wait().unwrap().success());
                     println!("{}", output_archive);