diff --git a/google/auth/aws.py b/google/auth/aws.py
index 8e6c6789c..ba91f70b3 100644
--- a/google/auth/aws.py
+++ b/google/auth/aws.py
@@ -530,7 +530,7 @@ def _get_metadata_security_credentials(
             google.auth.exceptions.RefreshError: If an error occurs while
                 retrieving the AWS security credentials.
         """
-        headers = {"Content-Type": "application/json"}
+        headers = {}
         if imdsv2_session_token is not None:
             headers["X-aws-ec2-metadata-token"] = imdsv2_session_token