diff --git a/src/applications/conduit/parametertype/ConduitParameterType.php b/src/applications/conduit/parametertype/ConduitParameterType.php
index 4eca31d96c..9adf435cf2 100644
--- a/src/applications/conduit/parametertype/ConduitParameterType.php
+++ b/src/applications/conduit/parametertype/ConduitParameterType.php
@@ -1,155 +1,156 @@
 <?php
 
 /**
  * Defines how to read a value from a Conduit request.
  *
  * This class behaves like @{class:AphrontHTTPParameterType}, but for Conduit.
  */
 abstract class ConduitParameterType extends Phobject {
 
 
   private $viewer;
 
 
   final public function setViewer(PhabricatorUser $viewer) {
     $this->viewer = $viewer;
     return $this;
   }
 
 
   final public function getViewer() {
     if (!$this->viewer) {
       throw new PhutilInvalidStateException('setViewer');
     }
     return $this->viewer;
   }
 
 
   final public function getExists(array $request, $key) {
     return $this->getParameterExists($request, $key);
   }
 
 
   final public function getValue(array $request, $key, $strict = true) {
     if (!$this->getExists($request, $key)) {
       return $this->getParameterDefault();
     }
 
     return $this->getParameterValue($request, $key, $strict);
   }
 
   final public function getKeys($key) {
     return $this->getParameterKeys($key);
   }
 
   final public function getDefaultValue() {
     return $this->getParameterDefault();
   }
 
 
   final public function getTypeName() {
     return $this->getParameterTypeName();
   }
 
 
   final public function getFormatDescriptions() {
     return $this->getParameterFormatDescriptions();
   }
 
 
   final public function getExamples() {
     return $this->getParameterExamples();
   }
 
   protected function raiseValidationException(array $request, $key, $message) {
     // TODO: Specialize this so we can give users more tailored messages from
     // Conduit.
     throw new Exception(
       pht(
         'Error while reading "%s": %s',
         $key,
         $message));
   }
 
 
   final public static function getAllTypes() {
     return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
       ->setUniqueMethod('getTypeName')
       ->setSortMethod('getTypeName')
       ->execute();
   }
 
 
   protected function getParameterExists(array $request, $key) {
     return array_key_exists($key, $request);
   }
 
   protected function getParameterValue(array $request, $key, $strict) {
     return $request[$key];
   }
 
   protected function getParameterKeys($key) {
     return array($key);
   }
 
   protected function parseStringValue(array $request, $key, $value, $strict) {
     if (!is_string($value)) {
       $this->raiseValidationException(
         $request,
         $key,
         pht('Expected string, got something else.'));
     }
     return $value;
   }
 
   protected function parseIntValue(array $request, $key, $value, $strict) {
     if (!$strict && is_string($value) && ctype_digit($value)) {
       $value = $value + 0;
       if (!is_int($value)) {
         $this->raiseValidationException(
           $request,
           $key,
           pht('Integer overflow.'));
       }
     } else if (!is_int($value)) {
       $this->raiseValidationException(
         $request,
         $key,
         pht('Expected integer, got something else.'));
     }
     return $value;
   }
 
   protected function parseBoolValue(array $request, $key, $value, $strict) {
     $bool_strings = array(
       '0' => false,
       '1' => true,
       'false' => false,
       'true' => true,
     );
 
-    if (!$strict && is_string($value) && isset($bool_strings[$value])) {
-      $value = $bool_strings[$value];
+    $normal_value = phutil_utf8_strtolower($value);
+    if (!$strict && is_string($value) && isset($bool_strings[$normal_value])) {
+      $value = $bool_strings[$normal_value];
     } else if (!is_bool($value)) {
       $this->raiseValidationException(
         $request,
         $key,
         pht('Expected boolean (true or false), got something else.'));
     }
     return $value;
   }
 
   abstract protected function getParameterTypeName();
 
 
   abstract protected function getParameterFormatDescriptions();
 
 
   abstract protected function getParameterExamples();
 
   protected function getParameterDefault() {
     return null;
   }
 
 }