diff --git a/src/lib.rs b/src/lib.rs
index 896fb0f..8bbc005 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -155,7 +155,7 @@ pub fn make_tests(config: &Config) -> Vec<test::TestDescAndFn> {
                            &config.src_base,
                            &PathBuf::new(),
                            &mut tests)
-        .unwrap();
+        .expect(&format!("Could not read tests from {}", config.src_base.display()));
     tests
 }