--- a/mozilla/config.py
+++ b/mozilla/config.py
@@ -1342,23 +1342,16 @@ PLATFORM_VARS = {
                 'PATH': '/tools/python/bin:/tools/buildbot/bin:/opt/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin',
                 'CCACHE_DIR': '/builds/ccache',
                 'CCACHE_COMPRESS': '1',
                 'CCACHE_UMASK': '002',
             },
             'enable_unittests': False,
             'enable_checktests': False,
             'talos_masters': None,
-            # These refer to items in passwords.secrets
-            # nightly_signing_servers defaults to dep-signing because we don't want
-            # random new branches to accidentally use nightly-signing, which signs
-            # with valid keys. Any branch that needs to be signed with these keys
-            # must be overridden explicitly.
-            'nightly_signing_servers': 'dep-signing',
-            'dep_signing_servers': 'dep-signing',
             'tooltool_manifest_src': 'browser/config/tooltool-manifests/macosx64/releng.manifest',
             'enable_ccache': True,
         },
         'win32-debug': {
             'mozharness_python': ['c:/mozilla-build/python27/python', '-u'],
             'reboot_command': [
                 'c:/mozilla-build/python27/python', '-u',
                 'scripts/external_tools/count_and_reboot.py',