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
@@ -26,3 +26,9 @@ if (!@constant('__LIBPHUTIL__')) {
 }
 
 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();
+}