diff --git a/google/auth/impersonated_credentials.py b/google/auth/impersonated_credentials.py
index 00cabac3a..72e61a1fe 100644
--- a/google/auth/impersonated_credentials.py
+++ b/google/auth/impersonated_credentials.py
@@ -100,7 +100,7 @@ def _make_iam_token_request(
     )
 
     if response.status != http_client.OK:
-        exceptions.RefreshError(_REFRESH_ERROR, response_body)
+        raise exceptions.RefreshError(_REFRESH_ERROR, response_body)
 
     try:
         token_response = json.loads(response_body)
diff --git a/system_tests/secrets.tar.enc b/system_tests/secrets.tar.enc
index 76bc77ae3..9baa3acd2 100644
Binary files a/system_tests/secrets.tar.enc and b/system_tests/secrets.tar.enc differ