diff --git a/src/clusterfuzz/_internal/swarming/__init__.py b/src/clusterfuzz/_internal/swarming/__init__.py
index 02ce56ecba..0369abcb62 100644
--- a/src/clusterfuzz/_internal/swarming/__init__.py
+++ b/src/clusterfuzz/_internal/swarming/__init__.py
@@ -251,7 +251,7 @@ def create_new_task_request(command: str, job_name: str, download_url: str
                   execution_timeout_secs=execution_timeout_secs,
                   env=swarming_bot_environment,
                   env_prefixes=env_prefixes,
-                  secret_bytes=base64.b64encode(download_url.encode('utf-8'))))
+                  secret_bytes=download_url.encode('utf-8')))
       ])
 
   return new_task_request
diff --git a/src/clusterfuzz/_internal/tests/core/swarming/swarming_test.py b/src/clusterfuzz/_internal/tests/core/swarming/swarming_test.py
index a8dab94820..c48d154058 100644
--- a/src/clusterfuzz/_internal/tests/core/swarming/swarming_test.py
+++ b/src/clusterfuzz/_internal/tests/core/swarming/swarming_test.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 """Swarming tests."""
-import base64
 import os
 import unittest
 from unittest import mock
@@ -106,8 +105,7 @@ def test_get_spec_from_config_with_docker_image(self):
                              '"IS_K8S_ENV": "True", "DISABLE_MOUNTS": "True", '
                              '"LOGGING_CLOUD_PROJECT_ID": "project_id"}')),
                     ],
-                    secret_bytes=base64.b64encode(
-                        'https://download_url'.encode('utf-8'))))
+                    secret_bytes='https://download_url'.encode('utf-8')))
         ])
     self.assertEqual(spec, expected_spec)
 
@@ -191,8 +189,7 @@ def test_get_spec_from_config_without_docker_image(self):
                                 'package_install_path/bin'
                             ])
                     ],
-                    secret_bytes=base64.b64encode(
-                        'https://download_url'.encode('utf-8'))))
+                    secret_bytes='https://download_url'.encode('utf-8')))
         ])
     self.assertEqual(spec, expected_spec)
 
@@ -251,8 +248,7 @@ def test_get_spec_from_config_for_fuzz_task(self):
                              '"IS_K8S_ENV": "True", "DISABLE_MOUNTS": "True", '
                              '"LOGGING_CLOUD_PROJECT_ID": "project_id"}')),
                     ],
-                    secret_bytes=base64.b64encode(
-                        'https://download_url'.encode('utf-8'))))
+                    secret_bytes='https://download_url'.encode('utf-8')))
         ])
     self.assertEqual(spec, expected_spec)
 
@@ -317,8 +313,7 @@ def test_push_swarming_task(self):
                              '"IS_K8S_ENV": "True", "DISABLE_MOUNTS": "True", '
                              '"LOGGING_CLOUD_PROJECT_ID": "project_id"}')),
                     ],
-                    secret_bytes=base64.b64encode(
-                        'https://download_url'.encode('utf-8'))))
+                    secret_bytes='https://download_url'.encode('utf-8')))
         ])
 
     self.mock.get_scoped_service_account_credentials.assert_called_with(