diff --git a/src/applications/config/management/PhabricatorConfigManagementSetWorkflow.php b/src/applications/config/management/PhabricatorConfigManagementSetWorkflow.php
index 6ad2db4471..d69e903bcc 100644
--- a/src/applications/config/management/PhabricatorConfigManagementSetWorkflow.php
+++ b/src/applications/config/management/PhabricatorConfigManagementSetWorkflow.php
@@ -1,173 +1,171 @@
 <?php
 
 final class PhabricatorConfigManagementSetWorkflow
   extends PhabricatorConfigManagementWorkflow {
 
   protected function didConstruct() {
     $this
       ->setName('set')
       ->setExamples(
         "**set** __key__ __value__\n".
         "**set** __key__ --stdin < value.json")
       ->setSynopsis(pht('Set a local configuration value.'))
       ->setArguments(
         array(
           array(
             'name'  => 'database',
             'help'  => pht(
               'Update configuration in the database instead of '.
               'in local configuration.'),
           ),
           array(
             'name' => 'stdin',
             'help' => pht('Read option value from stdin.'),
           ),
           array(
             'name'      => 'args',
             'wildcard'  => true,
           ),
         ));
   }
 
   public function execute(PhutilArgumentParser $args) {
     $argv = $args->getArg('args');
     if (!$argv) {
       throw new PhutilArgumentUsageException(
         pht('Specify the configuration key you want to set.'));
     }
 
     $is_stdin = $args->getArg('stdin');
 
     $key = $argv[0];
 
     if ($is_stdin) {
       if (count($argv) > 1) {
         throw new PhutilArgumentUsageException(
           pht(
             'Too many arguments: expected only a configuration key when '.
             'using "--stdin".'));
       }
 
       fprintf(STDERR, tsprintf("%s\n", pht('Reading value from stdin...')));
       $value = file_get_contents('php://stdin');
     } else {
       if (count($argv) == 1) {
         throw new PhutilArgumentUsageException(
           pht(
             'Specify a value to set the configuration key "%s" to, or '.
             'use "--stdin" to read a value from stdin.',
             $key));
       }
 
       if (count($argv) > 2) {
         throw new PhutilArgumentUsageException(
           pht(
             'Too many arguments: expected one key and one value.'));
       }
 
       $value = $argv[1];
     }
 
     $options = PhabricatorApplicationConfigOptions::loadAllOptions();
     if (empty($options[$key])) {
       throw new PhutilArgumentUsageException(
         pht(
           'Configuration key "%s" is unknown. Use "bin/config list" to list '.
           'all known keys.',
           $key));
     }
 
     $option = $options[$key];
 
     $type = $option->newOptionType();
     if ($type) {
       try {
         $value = $type->newValueFromCommandLineValue(
           $option,
           $value);
         $type->validateStoredValue($option, $value);
       } catch (PhabricatorConfigValidationException $ex) {
         throw new PhutilArgumentUsageException($ex->getMessage());
       }
     } else {
       // NOTE: For now, this handles both "wild" values and custom types.
       $type = $option->getType();
       switch ($type) {
         default:
           $value = json_decode($value, true);
           if (!is_array($value)) {
             switch ($type) {
               default:
                 $message = pht(
                   'Configuration key "%s" is of type "%s". Specify it in JSON.',
                   $key,
                   $type);
                 break;
             }
             throw new PhutilArgumentUsageException($message);
           }
           break;
       }
     }
 
     $use_database = $args->getArg('database');
     if ($option->getLocked() && $use_database) {
       throw new PhutilArgumentUsageException(
         pht(
           'Config key "%s" is locked and can only be set in local '.
           'configuration. To learn more, see "%s" in the documentation.',
           $key,
           pht('Configuration Guide: Locked and Hidden Configuration')));
     }
 
     try {
       $option->getGroup()->validateOption($option, $value);
     } catch (PhabricatorConfigValidationException $validation) {
       // Convert this into a usage exception so we don't dump a stack trace.
       throw new PhutilArgumentUsageException($validation->getMessage());
     }
 
     if ($use_database) {
       $config_entry = PhabricatorConfigEntry::loadConfigEntry($key);
       $config_entry->setValue($value);
 
       // If the entry has been deleted, resurrect it.
       $config_entry->setIsDeleted(0);
 
       $config_entry->save();
 
       $write_message = pht(
         'Wrote configuration key "%s" to database storage.',
         $key);
     } else {
       $config_source = new PhabricatorConfigLocalSource();
 
       $local_path = $config_source->getReadablePath();
 
       try {
-        Filesystem::assertWritable($local_path);
+        $config_source->setKeys(array($key => $value));
       } catch (FilesystemException $ex) {
         throw new PhutilArgumentUsageException(
           pht(
             'Local path "%s" is not writable. This file must be writable '.
             'so that "bin/config" can store configuration.',
             Filesystem::readablePath($local_path)));
       }
 
-      $config_source->setKeys(array($key => $value));
-
       $write_message = pht(
         'Wrote configuration key "%s" to local storage (in file "%s").',
         $key,
         $local_path);
     }
 
     echo tsprintf(
       "<bg:green>** %s **</bg> %s\n",
       pht('DONE'),
       $write_message);
 
     return 0;
   }
 
 }