diff --git a/src/Illuminate/Foundation/Testing/Concerns/InteractsWithDatabase.php b/src/Illuminate/Foundation/Testing/Concerns/InteractsWithDatabase.php
index d01994e3ccff..269293a76590 100644
--- a/src/Illuminate/Foundation/Testing/Concerns/InteractsWithDatabase.php
+++ b/src/Illuminate/Foundation/Testing/Concerns/InteractsWithDatabase.php
@@ -130,7 +130,7 @@ public function castAsJson($value)
     {
         if ($value instanceof Jsonable) {
             $value = $value->toJson();
-        } elseif (is_array($value)) {
+        } elseif (is_array($value) || is_object($value)) {
             $value = json_encode($value);
         }