diff --git a/crates/ty_python_semantic/mdtest.py b/crates/ty_python_semantic/mdtest.py
index e238c9ce89..c0795ed50c 100644
--- a/crates/ty_python_semantic/mdtest.py
+++ b/crates/ty_python_semantic/mdtest.py
@@ -46,6 +46,7 @@ class MDTestRunner:
                 CRATE_NAME,
                 "--no-run",
                 "--color=always",
+                "--test=mdtest",
                 "--message-format",
                 message_format,
             ],