diff -u b/modules/image/image.test b/modules/image/image.test
--- b/modules/image/image.test
+++ b/modules/image/image.test
@@ -590,7 +590,8 @@
 
     // Ensure that editing a default is not possible (without overriding).
     $this->drupalGet($edit_path);
-    $this->assertNoField('edit-name', t('Default styles may not be renamed.'));
+    $disabled_field = $this->xpath('//input[@id=:id and @disabled="disabled"]', array(':id' => 'edit-name'));
+    $this->assertTrue($disabled_field, t('Default styles may not be renamed.'));
     $this->assertNoField('edit-submit', t('Default styles may not be edited.'));
     $this->assertNoField('edit-add', t('Default styles may not have new effects added.'));
 
@@ -627,7 +628,8 @@
 
     // Check that we are unable to rename an overridden style.
     $this->drupalGet($edit_path);
-    $this->assertNoField('edit-name', t('Overridden styles may not be renamed.'));
+    $disabled_field = $this->xpath('//input[@id=:id and @disabled="disabled"]', array(':id' => 'edit-name'));
+    $this->assertTrue($disabled_field, t('Overridden styles may not be renamed.'));
 
     // Create an image to ensure the override works properly.
     $image_path = $this->createSampleImage($style);