diff --git a/src/workflow/liberate/ArcanistLiberateWorkflow.php b/src/workflow/liberate/ArcanistLiberateWorkflow.php
index 81ddbc77..dea2a113 100644
--- a/src/workflow/liberate/ArcanistLiberateWorkflow.php
+++ b/src/workflow/liberate/ArcanistLiberateWorkflow.php
@@ -162,9 +162,7 @@ EOTEXT
 
     echo "Verifying library...\n";
 
-    $err = 0;
-    $cmd = csprintf('%s liberate --verify -- %s', $arc_bin, $path);
-    passthru($cmd, $err);
+    $err = phutil_passthru('%s liberate --verify -- %s', $arc_bin, $path);
 
     $do_update = (!$err || $this->getArgument('force-update'));
 
diff --git a/src/workflow/liberate/__init__.php b/src/workflow/liberate/__init__.php
index aab0b048..ef7a7c2a 100644
--- a/src/workflow/liberate/__init__.php
+++ b/src/workflow/liberate/__init__.php
@@ -20,7 +20,6 @@ phutil_require_module('phutil', 'filesystem/filefinder');
 phutil_require_module('phutil', 'future/exec');
 phutil_require_module('phutil', 'moduleutils');
 phutil_require_module('phutil', 'utils');
-phutil_require_module('phutil', 'xsprintf/csprintf');
 
 
 phutil_require_source('ArcanistLiberateWorkflow.php');