diff --git a/core/modules/simpletest/tests/file.test b/core/modules/simpletest/tests/file.test
index 7496902..7ab794a 100644
--- a/core/modules/simpletest/tests/file.test
+++ b/core/modules/simpletest/tests/file.test
@@ -2024,6 +2024,19 @@ class FileSaveTest extends FileHookTestCase {
     $loaded_file = db_query('SELECT * FROM {file_managed} f WHERE f.fid = :fid', array(':fid' => $saved_file->fid))->fetch(PDO::FETCH_OBJ);
     $this->assertNotNull($loaded_file, t("Record still exists in the database."), 'File');
     $this->assertEqual($loaded_file->status, $saved_file->status, t("Status was saved correctly."));
+
+    // Try to insert a second file with the same name apart from case insensitivity
+    // to ensure the 'uri' index allows for filenames with different cases.
+    $file = (object) array(
+      'uid' => 1,
+      'filename' => 'DRUPLICON.txt',
+      'uri' => 'public://DRUPLICON.txt',
+      'filemime' => 'text/plain',
+      'timestamp' => 1,
+      'status' => FILE_STATUS_PERMANENT,
+    );
+    file_put_contents($file->uri, 'hello world');
+    file_save($file);
   }
 }
 
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 20e1dc1..3de544d 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -808,6 +808,7 @@ function system_schema() {
         'length' => 255,
         'not null' => TRUE,
         'default' => '',
+        'binary' => TRUE,
       ),
       'filemime' => array(
         'description' => "The file's MIME type.",