diff --git a/modules/image/image.module b/modules/image/image.module
index 5caf282..89b14ca 100644
--- a/modules/image/image.module
+++ b/modules/image/image.module
@@ -1094,6 +1094,7 @@ function image_effect_apply($image, $effect) {
  */
 function theme_image_style($variables) {
   $variables['path'] = image_style_url($variables['style_name'], $variables['path']);
+  $variables['attributes']['class'][] = 'style-name-' . $variables['style_name'];
   return theme('image', $variables);
 }