diff --git a/src/psij/testing/config.json b/src/psij/testing/config.json
index 66d1e50..a3f2837 100644
--- a/src/psij/testing/config.json
+++ b/src/psij/testing/config.json
@@ -5,7 +5,7 @@
         "from": "noreply@example.org",
         "callback-url": "https://example.org",
         "body": "mailtemplates/auth",
-        "body_auto": "mailtemplates/auth_auto",
+        "body-auto": "mailtemplates/auth-auto",
         "exception-body": "mailtemplates/exception",
         "exception-approved": "mailtemplates/exception-approved",
         "exception-rejected": "mailtemplates/exception-rejected"
diff --git a/src/psij/testing/mailtemplates/auth_auto.html b/src/psij/testing/mailtemplates/auth-auto.html
similarity index 100%
rename from src/psij/testing/mailtemplates/auth_auto.html
rename to src/psij/testing/mailtemplates/auth-auto.html
diff --git a/src/psij/testing/mailtemplates/auth_auto.plain b/src/psij/testing/mailtemplates/auth-auto.plain
similarity index 100%
rename from src/psij/testing/mailtemplates/auth_auto.plain
rename to src/psij/testing/mailtemplates/auth-auto.plain
diff --git a/src/psij/testing/service.py b/src/psij/testing/service.py
index 5b0b87c..1341aea 100644
--- a/src/psij/testing/service.py
+++ b/src/psij/testing/service.py
@@ -715,7 +715,7 @@ def _load_email_bodies(self, file_prefix: str, params: Dict[str, str]) -> MIMEMu
     def _send_key_email(self, email: str, id: str, token: str,
                         req: Optional[AuthKeyRequest]) -> None:
         if req:
-            template = 'body_auto'
+            template = 'body-auto'
             url = self.config['auth-email']['callback-url'] + '/verify?c=' + req.challenge
         else:
             template = 'body'