diff --git a/src/workflow/ArcanistDiffWorkflow.php b/src/workflow/ArcanistDiffWorkflow.php
--- a/src/workflow/ArcanistDiffWorkflow.php
+++ b/src/workflow/ArcanistDiffWorkflow.php
@@ -2504,47 +2504,35 @@
 
     echo pht('Uploading %d files...', count($need_upload))."\n";
 
-    // Now we're ready to upload the actual file data. If possible, we'll just
-    // transmit a hash of the file instead of the actual file data. If the data
-    // already exists, Phabricator can share storage. Check if we can use
-    // "file.uploadhash" yet (i.e., if the server is up to date enough).
-    // TODO: Drop this check once we bump the protocol version.
-    $conduit_methods = $this->getConduit()->callMethodSynchronous(
-      'conduit.query',
-      array());
-    $can_use_hash_upload = isset($conduit_methods['file.uploadhash']);
-
-    if ($can_use_hash_upload) {
-      $hash_futures = array();
-      foreach ($need_upload as $key => $spec) {
-        $hash_futures[$key] = $this->getConduit()->callMethod(
-          'file.uploadhash',
-          array(
-            'name' => $spec['name'],
-            'hash' => sha1($spec['data']),
-          ));
-      }
+    $hash_futures = array();
+    foreach ($need_upload as $key => $spec) {
+      $hash_futures[$key] = $this->getConduit()->callMethod(
+        'file.uploadhash',
+        array(
+          'name' => $spec['name'],
+          'hash' => sha1($spec['data']),
+        ));
+    }
 
-      $futures = id(new FutureIterator($hash_futures))
-        ->limit(8);
-      foreach ($futures as $key => $future) {
-        $type = $need_upload[$key]['type'];
-        $change = $need_upload[$key]['change'];
-        $name = $need_upload[$key]['name'];
+    $futures = id(new FutureIterator($hash_futures))
+      ->limit(8);
+    foreach ($futures as $key => $future) {
+      $type = $need_upload[$key]['type'];
+      $change = $need_upload[$key]['change'];
+      $name = $need_upload[$key]['name'];
 
-        $phid = null;
-        try {
-          $phid = $future->resolve();
-        } catch (Exception $e) {
-          // Just try uploading normally if the hash upload failed.
-          continue;
-        }
+      $phid = null;
+      try {
+        $phid = $future->resolve();
+      } catch (Exception $e) {
+        // Just try uploading normally if the hash upload failed.
+        continue;
+      }
 
-        if ($phid) {
-          $change->setMetadata("{$type}:binary-phid", $phid);
-          unset($need_upload[$key]);
-          echo pht("Uploaded '%s' (%s).", $name, $type)."\n";
-        }
+      if ($phid) {
+        $change->setMetadata("{$type}:binary-phid", $phid);
+        unset($need_upload[$key]);
+        echo pht("Uploaded '%s' (%s).", $name, $type)."\n";
       }
     }