diff --git a/google/cloud/storage/client.py b/google/cloud/storage/client.py
index 9cccf413b..e0b2af1ff 100644
--- a/google/cloud/storage/client.py
+++ b/google/cloud/storage/client.py
@@ -20,6 +20,7 @@
 import datetime
 import functools
 import json
+import os
 import warnings
 import google.api_core.client_options
 
@@ -1761,7 +1762,10 @@ def generate_signed_post_policy_v4(
         elif bucket_bound_hostname:
             url = f"{_bucket_bound_hostname_url(bucket_bound_hostname, scheme)}/"
         else:
-            url = f"https://storage.googleapis.com/{bucket_name}/"
+            api_access_endpoint = os.getenv(
+                "API_ENDPOINT_OVERRIDE", "https://storage.googleapis.com"
+            )
+            url = f"{api_access_endpoint}/{bucket_name}/"
 
         return {"url": url, "fields": policy_fields}
 
diff --git a/tests/system/test__signing.py b/tests/system/test__signing.py
index f6b81d7cb..3e8ca1752 100644
--- a/tests/system/test__signing.py
+++ b/tests/system/test__signing.py
@@ -16,7 +16,6 @@
 import datetime
 import hashlib
 import os
-import pytest
 import time
 
 import requests
@@ -380,10 +379,6 @@ def test_create_signed_resumable_upload_url_v4(storage_client, signing_bucket, n
     )
 
 
-@pytest.mark.skipif(
-    "API_ENDPOINT_OVERRIDE" in os.environ,
-    reason="Failing test for the overriding endpoint",
-)
 def test_generate_signed_post_policy_v4(
     storage_client, buckets_to_delete, blobs_to_delete, service_account, no_mtls
 ):