diff --git a/google/cloud/storage/_helpers.py b/google/cloud/storage/_helpers.py
index 282d9bcfb..c02be2b45 100644
--- a/google/cloud/storage/_helpers.py
+++ b/google/cloud/storage/_helpers.py
@@ -546,7 +546,7 @@ def _bucket_bound_hostname_url(host, scheme=None):
     if url_parts.scheme and url_parts.netloc:
         return host
 
-    return f"{scheme}://{host}/"
+    return f"{scheme}://{host}"
 
 
 def _api_core_retry_to_resumable_media_retry(retry, num_retries=None):
diff --git a/google/cloud/storage/client.py b/google/cloud/storage/client.py
index e6c4f33c6..9cccf413b 100644
--- a/google/cloud/storage/client.py
+++ b/google/cloud/storage/client.py
@@ -1759,7 +1759,7 @@ def generate_signed_post_policy_v4(
         if virtual_hosted_style:
             url = f"https://{bucket_name}.storage.googleapis.com/"
         elif bucket_bound_hostname:
-            url = _bucket_bound_hostname_url(bucket_bound_hostname, scheme)
+            url = f"{_bucket_bound_hostname_url(bucket_bound_hostname, scheme)}/"
         else:
             url = f"https://storage.googleapis.com/{bucket_name}/"
 
diff --git a/tests/unit/test__helpers.py b/tests/unit/test__helpers.py
index dbe0055df..174b96152 100644
--- a/tests/unit/test__helpers.py
+++ b/tests/unit/test__helpers.py
@@ -675,13 +675,13 @@ def _call_fut(self, **args):
         return _bucket_bound_hostname_url(**args)
 
     def test_full_hostname(self):
-        HOST = "scheme://domain.tcl/"
+        HOST = "scheme://domain.tcl"
         self.assertEqual(self._call_fut(host=HOST), HOST)
 
     def test_hostname_and_scheme(self):
         HOST = "domain.tcl"
         SCHEME = "scheme"
-        EXPECTED_URL = SCHEME + "://" + HOST + "/"
+        EXPECTED_URL = SCHEME + "://" + HOST
 
         self.assertEqual(self._call_fut(host=HOST, scheme=SCHEME), EXPECTED_URL)
 
diff --git a/tests/unit/test_client.py b/tests/unit/test_client.py
index 6769f3020..c100d35b0 100644
--- a/tests/unit/test_client.py
+++ b/tests/unit/test_client.py
@@ -2572,7 +2572,7 @@ def test_get_signed_policy_v4_bucket_bound_hostname(self):
                 bucket_bound_hostname="https://bucket.bound_hostname",
                 credentials=_create_signing_credentials(),
             )
-        self.assertEqual(policy["url"], "https://bucket.bound_hostname")
+        self.assertEqual(policy["url"], "https://bucket.bound_hostname/")
 
     def test_get_signed_policy_v4_bucket_bound_hostname_with_scheme(self):
         import datetime