diff --git a/tests/test_verify_authentication_response.py b/tests/test_verify_authentication_response.py
index 83565e9..accaef0 100644
--- a/tests/test_verify_authentication_response.py
+++ b/tests/test_verify_authentication_response.py
@@ -19,7 +19,7 @@ def test_verify_authentication_response_with_EC2_public_key(self):
             },
             "type": "public-key",
             "clientExtensionResults": {}
-        }""",
+        }"""
         )
         challenge = base64url_to_bytes(
             "xi30GPGAFYRxVDpY1sM10DaLzVQG66nv-_7RUazH0vI2YvG8LYgDEnvN5fZZNVuvEDuMi9te3VLqb42N0fkLGA"
@@ -45,7 +45,7 @@ def test_verify_authentication_response_with_EC2_public_key(self):
         )
         assert verification.new_sign_count == 78
         assert verification.credential_backed_up == False
-        assert verification.credential_device_type == "single_device"
+        assert verification.credential_device_type == 'single_device'
 
     def test_verify_authentication_response_with_RSA_public_key(self):
         credential = AuthenticationCredential.parse_raw(
@@ -60,7 +60,7 @@ def test_verify_authentication_response_with_RSA_public_key(self):
                 },
                 "type": "public-key",
                 "clientExtensionResults": {}
-            }""",
+            }"""
         )
         challenge = base64url_to_bytes(
             "iPmAi1Pp1XL6oAgq3PWZtZPnZa1zFUDoGbaQ0_KvVG1lF2s3Rt_3o4uSzccy0tmcTIpTTT4BU1T-I4maavndjQ"
@@ -96,7 +96,7 @@ def test_raises_exception_on_incorrect_public_key(self):
             },
             "type": "public-key",
             "clientExtensionResults": {}
-        }""",
+        }"""
         )
         challenge = base64url_to_bytes(
             "zsfiMZj16TUVCrT5tDRYXdYlUrJp7zn_UNd5NmBocPc4I2dKZbeEWpwBAwA4s6oHkVX6_ly_jgp743dyiWHYYw"
diff --git a/tests/test_verify_registration_response.py b/tests/test_verify_registration_response.py
index 614e3f3..7dab1df 100644
--- a/tests/test_verify_registration_response.py
+++ b/tests/test_verify_registration_response.py
@@ -60,7 +60,7 @@ def test_verifies_none_attestation_response(self) -> None:
         assert verification.credential_type == PublicKeyCredentialType.PUBLIC_KEY
         assert verification.sign_count == 23
         assert verification.credential_backed_up == False
-        assert verification.credential_device_type == "single_device"
+        assert verification.credential_device_type == 'single_device'
 
     def test_raises_exception_on_unsupported_attestation_type(self) -> None:
         cred_json = {
diff --git a/webauthn/helpers/bytes_to_base64url.py b/webauthn/helpers/bytes_to_base64url.py
index e323bc9..b3bd321 100644
--- a/webauthn/helpers/bytes_to_base64url.py
+++ b/webauthn/helpers/bytes_to_base64url.py
@@ -5,4 +5,4 @@ def bytes_to_base64url(val: bytes) -> str:
     """
     Base64URL-encode the provided bytes
     """
-    return urlsafe_b64encode(val).decode("utf-8")  # .replace("=", "")
+    return urlsafe_b64encode(val).decode("utf-8")
diff --git a/webauthn/helpers/structs.py b/webauthn/helpers/structs.py
index 3bb586d..cc2dbc3 100644
--- a/webauthn/helpers/structs.py
+++ b/webauthn/helpers/structs.py
@@ -14,6 +14,7 @@
 
     PYDANTIC_V2 = False
 
+from .base64url_to_bytes import base64url_to_bytes
 from .bytes_to_base64url import bytes_to_base64url
 from .cose import COSEAlgorithmIdentifier
 from .json_loads_base64url_to_bytes import json_loads_base64url_to_bytes