diff --git a/python/tidy/servo_tidy_tests/Cargo.toml b/python/tidy/servo_tidy_tests/Cargo.toml
index ce9526462e4..c664352e45f 100644
--- a/python/tidy/servo_tidy_tests/Cargo.toml
+++ b/python/tidy/servo_tidy_tests/Cargo.toml
@@ -6,3 +6,6 @@ publish = false
 
 [dependencies]
 test-package = { version = "*" }
+
+[lib]
+path = "lib.rs"
\ No newline at end of file