diff --git a/include/class.file.php b/include/class.file.php
index 048b6f4faa64127c3a7726a9bc91a1f33ca1f69d..a5c0abef1e851d887494eaedc8d7aaa03533705b 100644
--- a/include/class.file.php
+++ b/include/class.file.php
@@ -295,7 +295,7 @@ class AttachmentFile {
         return false;
     }
 
-    function save(&$file, $ft=false) {
+    function save(&$file, $ft='T') {
 
         if (isset($file['data'])) {
             // Allow a callback function to delay or avoid reading or
diff --git a/include/upgrader/streams/core/15b30765-dd0022fb.task.php b/include/upgrader/streams/core/15b30765-dd0022fb.task.php
index bb2df98bdf338eefc81cc0c29777ea5b95ade1ce..a4f39fb785021a4abf4e581f9510ecd8688d9e19 100644
--- a/include/upgrader/streams/core/15b30765-dd0022fb.task.php
+++ b/include/upgrader/streams/core/15b30765-dd0022fb.task.php
@@ -108,7 +108,7 @@ class AttachmentMigrater extends MigrationTask {
         }
         # TODO: Add extension-based mime-type lookup
 
-        if (!($fileId = AttachmentFile::save($info))) {
+        if (!($fileId = AttachmentFile::save($info, false))) {
             return $this->skip($info['attachId'],
                 sprintf('%s: Unable to migrate attachment', $info['path']));
         }