diff --git a/indefero/src/IDF/Views/Source.php b/indefero/src/IDF/Views/Source.php
index abb584a..6c1a5a4 100644
--- a/indefero/src/IDF/Views/Source.php
+++ b/indefero/src/IDF/Views/Source.php
@@ -211,7 +211,9 @@ class IDF_Views_Source
         if ($request_file_info->type != 'tree') {
             $info = self::getRequestedFileMimeType($request_file_info,
                                                    $commit, $scm);
-            if (!IDF_FileUtil::isText($info) && !IDF_FileUtil::isImage($info)) {
+            $previewSizeLimit = Pluf::f("preview_size_limit", 2000000);
+            if (!IDF_FileUtil::isText($info) && !IDF_FileUtil::isImage($info) ||
+                (!IDF_FileUtil::isImage($info) && $request_file_info->size >= $previewSizeLimit)) {
                 $rep = new Pluf_HTTP_Response($scm->getFile($request_file_info),
                                               $info[0]);
                 $rep->headers['Content-Disposition'] = 'attachment; filename="'.$info[1].'"';