diff --git a/src/lint/renderer/ArcanistCheckstyleXMLLintRenderer.php b/src/lint/renderer/ArcanistCheckstyleXMLLintRenderer.php
--- a/src/lint/renderer/ArcanistCheckstyleXMLLintRenderer.php
+++ b/src/lint/renderer/ArcanistCheckstyleXMLLintRenderer.php
@@ -9,7 +9,7 @@
 
   public function __construct() {
     $this->writer = new XMLWriter();
-    $this->writer->openMemory();
+    $this->writer->openURI('checkstyle.xml');
     $this->writer->setIndent(true);
     $this->writer->setIndentString('  ');
   }
@@ -18,7 +18,7 @@
     $this->writer->startDocument('1.0', 'UTF-8');
     $this->writer->startElement('checkstyle');
     $this->writer->writeAttribute('version', '4.3');
-    return $this->writer->flush();
+    $this->writer->flush();
   }
 
   public function renderLintResult(ArcanistLintResult $result) {
@@ -39,7 +39,7 @@
     }
 
     $this->writer->endElement();
-    return $this->writer->flush();
+    $this->writer->flush();
   }
 
   public function renderOkayResult() {
@@ -49,7 +49,7 @@
   public function renderPostamble() {
     $this->writer->endElement();
     $this->writer->endDocument();
-    return $this->writer->flush();
+    $this->writer->flush();
   }
 
 }