diff --git a/scripts/__init_script__.php b/scripts/__init_script__.php
index 7ebd0c28..58705205 100644
--- a/scripts/__init_script__.php
+++ b/scripts/__init_script__.php
@@ -1,28 +1,34 @@
 <?php
 
 /*
  * Copyright 2011 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 $include_path = ini_get('include_path');
 ini_set('include_path', $include_path.':'.dirname(__FILE__).'/../../');
 @require_once 'libphutil/src/__phutil_library_init__.php';
 if (!@constant('__LIBPHUTIL__')) {
   echo "ERROR: Unable to load libphutil. Update your PHP 'include_path' to ".
        "include the parent directory of libphutil/.\n";
   exit(1);
 }
 
 phutil_load_library(dirname(__FILE__).'/../src/');
+
+// There may be some kind of auto-prepend script configured which starts an
+// output buffer. Discard any such output buffers.
+while (ob_get_level() > 0) {
+  ob_end_clean();
+}