diff --git a/crates/ailang-core/src/workspace.rs b/crates/ailang-core/src/workspace.rs
index 0029ac2..650cf1f 100644
--- a/crates/ailang-core/src/workspace.rs
+++ b/crates/ailang-core/src/workspace.rs
@@ -1180,9 +1180,7 @@ mod tests {
     /// model requires `instance S T` whenever `instance C T` exists.
     #[test]
     fn instance_without_superclass_instance_fires() {
-        let entry = std::path::PathBuf::from(
-            "../../examples/test_22b2_missing_superclass_instance.ail.json",
-        );
+        let entry = examples_dir().join("test_22b2_missing_superclass_instance.ail.json");
         let err = load_workspace(&entry)
             .expect_err("must fire missing-superclass-instance");
         match err {