diff --git a/tests/unit/captcha/test_hcaptcha.py b/tests/unit/captcha/test_hcaptcha.py
index 07797eb22aa2..920236466248 100644
--- a/tests/unit/captcha/test_hcaptcha.py
+++ b/tests/unit/captcha/test_hcaptcha.py
@@ -183,7 +183,7 @@ def test_invalid_error_code(self):
         responses.add(
             responses.POST,
             hcaptcha.VERIFY_URL,
-            json={"success": False, "error_codes": ["foo"]},
+            json={"success": False, "error-codes": ["foo"]},
         )
         serv = hcaptcha.Service.create_service(context=None, request=_REQUEST)
 
@@ -200,7 +200,7 @@ def test_valid_error_code(self):
             hcaptcha.VERIFY_URL,
             json={
                 "success": False,
-                "error_codes": ["invalid-or-already-seen-response"],
+                "error-codes": ["invalid-or-already-seen-response"],
             },
         )
         serv = hcaptcha.Service.create_service(context=None, request=_REQUEST)
diff --git a/warehouse/captcha/hcaptcha.py b/warehouse/captcha/hcaptcha.py
index f417b8a6909a..9588847649d1 100644
--- a/warehouse/captcha/hcaptcha.py
+++ b/warehouse/captcha/hcaptcha.py
@@ -149,7 +149,7 @@ def verify_response(self, response, remote_ip=None) -> ChallengeResponse | None:
 
         if resp.status_code != http.HTTPStatus.OK or not data["success"]:
             try:
-                error_codes = data["error_codes"]
+                error_codes = data["error-codes"]
             except KeyError as e:
                 raise UnexpectedError(
                     f"Response missing 'error-codes' key: {data}"