diff --git a/Tester/Framework/Dumper.php b/Tester/Framework/Dumper.php
index b920fcc..11f09a3 100644
--- a/Tester/Framework/Dumper.php
+++ b/Tester/Framework/Dumper.php
@@ -246,8 +246,14 @@ class Dumper
                        $message = get_class($e) . ": {$e->getMessage()}";
                }

-               $s = "\033[1;37m$message\033[0m\n\n"
-                       . (isset($stored) ? "diff " . escapeshellarg($stored[0]) . " " . escapeshellarg($stored[1]) . "\n\n" : '');
+               $s = "\033[1;37m$message\033[0m\n\n";
+
+               if (isset($stored)) {
+                       $left = escapeshellarg($stored[0]);
+                       $right = escapeshellarg($stored[1]);
+                       $s .= `diff --side-by-side $left $right | colordiff`;
+                       $s .= "\n\n";
+               }

                foreach ($trace as $item) {
                        $item += array('file' => NULL);