diff --git a/lib/filestorage/file_system.php b/lib/filestorage/file_system.php
index 3d6ff5b6056..21ebe77086e 100644
--- a/lib/filestorage/file_system.php
+++ b/lib/filestorage/file_system.php
@@ -362,7 +362,7 @@ abstract class file_system {
     public function add_to_curl_request(stored_file $file, &$curlrequest, $key) {
         // Note: curl_file_create does not work with remote paths.
         $path = $this->get_local_path_from_storedfile($file, true);
-        $curlrequest->_tmp_file_post_params[$key] = curl_file_create($path);
+        $curlrequest->_tmp_file_post_params[$key] = curl_file_create($path, null, $file->get_filename());
     }
 
     /**
diff --git a/lib/tests/filelib_test.php b/lib/tests/filelib_test.php
index cb40c8fe7e8..b6109d98164 100644
--- a/lib/tests/filelib_test.php
+++ b/lib/tests/filelib_test.php
@@ -545,6 +545,29 @@ class core_filelib_testcase extends advanced_testcase {
         $this->assertSame('OK', $contents);
     }
 
+    public function test_curl_file_name() {
+        $this->resetAfterTest();
+        $testurl = $this->getExternalTestFileUrl('/test_file_name.php');
+
+        $fs = get_file_storage();
+        $filerecord = array(
+            'contextid' => context_system::instance()->id,
+            'component' => 'test',
+            'filearea' => 'curl_post',
+            'itemid' => 0,
+            'filepath' => '/',
+            'filename' => 'test.txt'
+        );
+        $teststring = 'moodletest';
+        $testfile = $fs->create_file_from_string($filerecord, $teststring);
+
+        // Test post with file.
+        $data = array('testfile' => $testfile);
+        $curl = new curl();
+        $contents = $curl->post($testurl, $data);
+        $this->assertSame('OK', $contents);
+    }
+
     public function test_curl_protocols() {
 
         // HTTP and HTTPS requests were verified in previous requests. Now check
diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index 38772ea50e4..1c0781b3291 100644
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -46,6 +46,7 @@ information provided here is intended especially for developers.
   update to use the ModalEvents.save and ModalEvents.cancel events instead of their yes/no counterparts.
 * Instead of checking the 'moodle/course:viewparticipants' and 'moodle/site:viewparticipants' capabilities use the
   new functions course_can_view_participants() and course_require_view_participants().
+* $stored_file->add_to_curl_request() now adds the filename to the curl request.
 
 === 3.3.1 ===