diff --git a/runtime/lib/parser/yaml/sfYamlInline.php b/runtime/lib/parser/yaml/sfYamlInline.php
index a75208f77..331802a00 100644
--- a/runtime/lib/parser/yaml/sfYamlInline.php
+++ b/runtime/lib/parser/yaml/sfYamlInline.php
@@ -122,10 +122,8 @@ protected static function dumpArray($value)
   {
     // array
     $keys = array_keys($value);
-    if (
-      (1 == count($keys) && '0' == $keys[0])
-      ||
-      (count($keys) > 1 && array_reduce($keys, function($v, $w) { return (integer) $v + $w; }, 0) == count($keys) * (count($keys) - 1) / 2))
+    
+    if (count($value) > 0 && array_values($value) === $value)
     {
       $output = array();
       foreach ($value as $val) {