diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 7cea973b5d4533b288e0be680ba87c173680665f..21393b558f851dfa01aa04248538723a8cce9270 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,5 +1,11 @@
 // $Id$
 
+Feeds XXX
+---------
+
+- #838018-12 Remove Formatted Number CCK mapper, cannot be properly tested, see
+  #857928.
+
 Feeds 6.x 1.0 Beta 3, 2010-07-18
 --------------------------------
 
diff --git a/mappers/formatted_number.inc b/mappers/formatted_number.inc
deleted file mode 100644
index f2647630f828feb56a18680d027ad9bc125a23b6..0000000000000000000000000000000000000000
--- a/mappers/formatted_number.inc
+++ /dev/null
@@ -1,54 +0,0 @@
-<?php
-// $Id$
-
-/**
- * @file
- * On behalf implementation of Feeds mapping API for Formatted Number CCK.
- */
-
-/**
- * Implementation of feeds_node_processor_target_alter().
- */
-function formatted_number_feeds_node_processor_targets_alter(&$targets, $content_type) {
-  if (module_exists('formatted_number')) {
-    $info = content_types($content_type);
-    $fields = array();
-    if (isset($info['fields']) && count($info['fields'])) {
-      foreach ($info['fields'] as $field_name => $field) {
-        if (in_array($field['type'], array_keys(formatted_number_get_fields_info()))) {
-          $fields[$field_name] = isset($field['widget']['label']) ? $field['widget']['label'] : $field_name;
-        }
-      }
-    }
-    foreach ($fields as $k => $name) {
-      $targets[$k] = array(
-        'name' => $name,
-        'callback' => 'formatted_number_feeds_set_target',
-        'description' => t('The CCK !name field of the node.', array('!name' => $name)),
-      );
-    }
-  }
-}
-
-/**
- * Set the CCK field target after import.
- */
-function formatted_number_feeds_set_target($node, $target, $value) {
-  $field = isset($node->$target) ? $node->$target : array();
-
-  // Handle multiple value fields.
-  if (is_array($value)) {
-    $i = 0;
-    foreach ($value as $v) {
-      if (!is_array($v) && !is_object($v)) {
-        $field[$i]['value'] = parse_formatted_number($v, TRUE);
-      }
-      $i++;
-    }
-  }
-  else {
-    $field[0]['value'] = parse_formatted_number($value, TRUE);
-  }
-
-  $node->$target = $field;
-}
diff --git a/tests/feeds_mapper_formatted_number.test b/tests/feeds_mapper_formatted_number.test
deleted file mode 100644
index 76a6b22737acf17f7feeabfca7fc411faee30319..0000000000000000000000000000000000000000
--- a/tests/feeds_mapper_formatted_number.test
+++ /dev/null
@@ -1,102 +0,0 @@
-<?php
-// $Id$
-
-/**
- * @file
- * Test case for simple CCK field mapper mappers/content.inc.
- */
-
-require_once(drupal_get_path('module', 'feeds') . '/tests/feeds_mapper_test.inc');
-
-/**
- * Class for testing Feeds <em>formatted_number</em> mapper.
- */
-class FeedsMapperFormattedNumberTestCase extends FeedsMapperTestCase {
-
-  public static function getInfo() {
-    return array(
-      'name' => t('Mapper: Formatted Number'),
-      'description' => t('Test Feeds Mapper support for Formatted Number CCK fields. <strong>Requires CCK, Format Number API and Formatted Number CCK modules</strong>.'),
-      'group' => t('Feeds'),
-    );
-  }
-
-  /**
-   * Set up the test.
-   */
-  function setUp() {
-    // Call parent setup with required modules.
-    parent::setUp('feeds', 'feeds_ui', 'ctools', 'content', 'format_number', 'formatted_number');
-
-    // Create user and login.
-    $this->drupalLogin($this->drupalCreateUser(
-        array(
-          'administer content types',
-          'administer feeds',
-          'administer nodes',
-          'administer site configuration'
-        )
-    ));
-  }
-
-  /**
-   * Basic test loading a doulbe entry CSV file.
-   */
-  function test() {
-
-    // Create content type.
-    $typename = $this->createContentType(NULL, array(
-      'beta' => array('type' => 'formatted_integer', 'widget' => 'formatted_number'),
-      'gamma' => array('type' => 'formatted_decimal', 'widget' => 'formatted_number'),
-      'delta' => array('type' => 'formatted_float', 'widget' => 'formatted_number'),
-    ));
-
-    // Create and configure importer.
-    $this->createFeedConfiguration('Content CSV', 'csv');
-    $this->setSettings('csv', NULL, array('content_type' => '','import_period' => FEEDS_SCHEDULE_NEVER,));
-    $this->setPlugin('csv', 'FeedsFileFetcher');
-    $this->setPlugin('csv', 'FeedsCSVParser');
-    $this->setSettings('csv', 'FeedsNodeProcessor', array('content_type' => $typename));
-    $this->addMappings('csv', array(
-      array(
-        'source' => 'title',
-        'target' => 'title',
-      ),
-      array(
-        'source' => 'created',
-        'target' => 'created',
-      ),
-      array(
-        'source' => 'body',
-        'target' => 'body',
-      ),
-      array(
-        'source' => 'beta',
-        'target' => 'field_beta',
-      ),
-      array(
-        'source' => 'gamma',
-        'target' => 'field_gamma',
-      ),
-      array(
-        'source' => 'delta',
-        'target' => 'field_delta',
-      ),
-    ));
-
-    // Import CSV file.
-    $this->importFile('csv', $this->absolutePath() .'/tests/feeds/content.csv');
-    $this->assertText('Created 2 '. $typename .' nodes.');
-
-    // Check the two imported files.
-    $this->drupalGet('node/1/edit');
-    $this->assertCCKFieldValue('beta', '42');
-    $this->assertCCKFieldValue('gamma', '4.20');
-    $this->assertCCKFieldValue('delta', '3.14');
-
-    $this->drupalGet('node/2/edit');
-    $this->assertCCKFieldValue('beta', '32');
-    $this->assertCCKFieldValue('gamma', '1.20');
-    $this->assertCCKFieldValue('delta', '5.63');
-  }
-}