diff --git a/tests/credentials.py b/tests/credentials.py
index ef2d62a8..924010de 100644
--- a/tests/credentials.py
+++ b/tests/credentials.py
@@ -3,7 +3,7 @@
 from dataclasses import dataclass
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, kw_only=True)
 class VWSCredentials:
     """Vuforia Web Services credentials."""