diff --git a/src/Service/Loco.php b/src/Service/Loco.php
index 4bc1e62..d96fc1b 100644
--- a/src/Service/Loco.php
+++ b/src/Service/Loco.php
@@ -333,7 +333,11 @@ private function flatten(array &$messages, array $subnode = null, $path = null)
                     unset($messages[$key]);
                 }
             } elseif (null !== $path) {
-                $messages[$path.'.'.$key] = $value;
+                if ($key !== 0) {
+                    $messages[$path.'.'.$key] = $value;
+                } else {
+                    $messages[$path] = $value;
+                }
             }
         }
     }