diff --git a/modules/image/image.module b/modules/image/image.module
index 0e0e457..9203b2d 100644
--- a/modules/image/image.module
+++ b/modules/image/image.module
@@ -293,7 +293,7 @@ function image_file_download($uri) {
       // Check the permissions of the original to grant access to this image.
       $headers = module_invoke_all('file_download', $original_uri);
       // Confirm there's at least one module granting access and none denying access.
-      if (!empty($headers) && !in_array(-1, $headers)) {
+      if (!in_array(-1, $headers)) {
         return array(
           // Send headers describing the image's size, and MIME-type...
           'Content-Type' => $info['mime_type'],
diff --git a/modules/image/image.test b/modules/image/image.test
index 1ca8465..f120156 100644
--- a/modules/image/image.test
+++ b/modules/image/image.test
@@ -218,6 +218,12 @@ class ImageStylesPathAndUrlTestCase extends DrupalWebTestCase {
       $this->drupalGet($generate_url);
       $this->assertResponse(200, t('Image was generated at the URL.'));
 
+      // Make sure that access is denied for existing style files if we do not
+      // have access.
+      variable_del('image_module_test_file_download');
+      $this->drupalGet($generate_url);
+      $this->assertResponse(403, 'Confirmed that access is denied for the private image style.');
+
       // Repeat this with a different file that we do not have access to and
       // make sure that access is denied.
       $file_noaccess = array_shift($files);