diff --git a/modules/image/image.module b/modules/image/image.module
index fcbf62c..b3ba7c4 100644
--- a/modules/image/image.module
+++ b/modules/image/image.module
@@ -969,9 +969,10 @@ function image_style_transform_dimensions($style_name, array &$dimensions) {
  *   An image style array.
  */
 function image_style_flush($style) {
-  $style_directory = drupal_realpath(file_default_scheme() . '://styles/' . $style['name']);
-  if (is_dir($style_directory)) {
-    file_unmanaged_delete_recursive($style_directory);
+  // Delete the style directory in each registered wrapper.
+  $wrappers = file_get_stream_wrappers(STREAM_WRAPPERS_WRITE_VISIBLE);
+  foreach ($wrappers as $wrapper => $wrapper_data) {
+    file_unmanaged_delete_recursive($wrapper . '://styles/' . $style['name']);
   }
 
   // Let other modules update as necessary on flush.
diff --git a/modules/image/image.test b/modules/image/image.test
index 59fc77d..7db68e6 100644
--- a/modules/image/image.test
+++ b/modules/image/image.test
@@ -17,7 +17,6 @@
  *   image_style_save()
  *   image_style_delete()
  *   image_style_options()
- *   image_style_flush()
  *   image_effect_definition_load()
  *   image_effect_load()
  *   image_effect_save()
@@ -1749,3 +1748,108 @@ class ImageThemeFunctionWebTestCase extends DrupalWebTestCase {
   }
 
 }
+
+/**
+ * Tests flushing of image styles.
+ */
+class ImageStyleFlushTest extends ImageFieldTestCase {
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Image style flushing',
+      'description' => 'Tests flushing of image styles.',
+      'group' => 'Image',
+    );
+  }
+
+  /**
+   * Given an image style and a wrapper, generate an image.
+   */
+  function createSampleImage($style, $wrapper) {
+    static $file;
+
+    if (!isset($file)) {
+      $files = $this->drupalGetTestFiles('image');
+      $file = reset($files);
+    }
+
+    // Make sure we have an image in our wrapper testing file directory.
+    $source_uri = file_unmanaged_copy($file->uri, $wrapper . '://');
+    // Build the derivative image.
+    $derivative_uri = image_style_path($style['name'], $source_uri);
+    $derivative = image_style_create_derivative($style, $source_uri, $derivative_uri);
+
+    return $derivative ? $derivative_uri : FALSE;
+  }
+
+  /**
+   * Count the number of images currently created for a style in a wrapper.
+   */
+  function getImageCount($style, $wrapper) {
+    return count(file_scan_directory($wrapper . '://styles/' . $style['name'], '/.*/'));
+  }
+
+  /**
+   * General test to flush a style.
+   */
+  function testFlush() {
+
+    // Setup a style to be created and effects to add to it.
+    $style_name = strtolower($this->randomName(10));
+    $style_label = $this->randomString();
+    $style_path = 'admin/config/media/image-styles/edit/' . $style_name;
+    $effect_edits = array(
+      'image_resize' => array(
+        'data[width]' => 100,
+        'data[height]' => 101,
+      ),
+      'image_scale' => array(
+        'data[width]' => 110,
+        'data[height]' => 111,
+        'data[upscale]' => 1,
+      ),
+    );
+
+    // Add style form.
+    $edit = array(
+      'name' => $style_name,
+      'label' => $style_label,
+    );
+    $this->drupalPost('admin/config/media/image-styles/add', $edit, t('Create new style'));
+    // Add each sample effect to the style.
+    foreach ($effect_edits as $effect => $edit) {
+      // Add the effect.
+      $this->drupalPost($style_path, array('new' => $effect), t('Add'));
+      if (!empty($edit)) {
+        $this->drupalPost(NULL, $edit, t('Add effect'));
+      }
+    }
+
+    // Load the saved image style.
+    $style = image_style_load($style_name);
+
+    // Create an image for the 'public' wrapper.
+    $image_path = $this->createSampleImage($style, 'public');
+    // Expecting to find 2 images, one is the sample.png image shown in
+    // image style preview.
+    $this->assertEqual($this->getImageCount($style, 'public'), 2, format_string('Image style %style image %file successfully generated.', array('%style' => $style['name'], '%file' => $image_path)));
+
+    // Create an image for the 'private' wrapper.
+    $image_path = $this->createSampleImage($style, 'private');
+    $this->assertEqual($this->getImageCount($style, 'private'), 1, format_string('Image style %style image %file successfully generated.', array('%style' => $style['name'], '%file' => $image_path)));
+
+    // Remove the 'image_scale' effect and updates the style, which in turn
+    // forces an image style flush.
+    $effect = array_pop($style['effects']);
+    $this->drupalPost($style_path . '/effects/' . $effect['ieid'] . '/delete', array(), t('Delete'));
+    $this->assertResponse(200);
+    $this->drupalPost($style_path, array(), t('Update style'));
+    $this->assertResponse(200);
+
+    // Post flush, expected 1 image in the 'public' wrapper (sample.png).
+    $this->assertEqual($this->getImageCount($style, 'public'), 1, format_string('Image style %style flushed correctly for %wrapper wrapper.', array('%style' => $style['name'], '%wrapper' => 'public')));
+
+    // Post flush, expected no image in the 'private' wrapper.
+    $this->assertEqual($this->getImageCount($style, 'private'), 0, format_string('Image style %style flushed correctly for %wrapper wrapper.', array('%style' => $style['name'], '%wrapper' => 'private')));
+  }
+}