diff --git a/src/ci/docker/scripts/fuchsia-test-runner.py b/src/ci/docker/scripts/fuchsia-test-runner.py
index 115ee69a5891..6db25ff1a809 100755
--- a/src/ci/docker/scripts/fuchsia-test-runner.py
+++ b/src/ci/docker/scripts/fuchsia-test-runner.py
@@ -112,7 +112,7 @@ def atomic_link(link: Path, target: Path):
             os.remove(tmp_file)
 
 
-@dataclass(kw_only=True)
+@dataclass
 class TestEnvironment:
     rust_build_dir: Path
     sdk_dir: Path