diff --git a/tests/thin_delta.rs b/tests/thin_delta.rs
index c9d355a..f5c4e1c 100644
--- a/tests/thin_delta.rs
+++ b/tests/thin_delta.rs
@@ -46,7 +46,7 @@ impl<'a> Program<'a> for ThinDelta {
     }
 
     fn bad_option_hint(option: &str) -> String {
-        msg::bad_option_hint(option)
+        format!("unrecognized option '{}'", option)
     }
 }