diff --git a/tests/step_implementers/sign_container_image/test_curl_push.py b/tests/step_implementers/sign_container_image/test_curl_push.py
index 8e81c569..a0490e1b 100644
--- a/tests/step_implementers/sign_container_image/test_curl_push.py
+++ b/tests/step_implementers/sign_container_image/test_curl_push.py
@@ -145,7 +145,7 @@ def test_push_container_signature_specify_curl_implementer_success(self, curl_mo
                 '--header', StringRegexParam(r'X-Checksum-Sha1:.+'),
                 '--header', StringRegexParam(r'X-Checksum-MD5:.+'),
                 '--user', "admin:adminPassword",
-                '--data-binary', f"@{container_image_signature_file_path}",
+                '--upload-file', container_image_signature_file_path,
                 f"https://sigserver/signatures/{container_image_signature_name}",
                 _out=Any(IOBase),
                 _err_to_out=True,