diff --git a/Facebook.Unity/Utils/MiniJson.cs b/Facebook.Unity/Utils/MiniJson.cs
index 5ca00def8..acb87eb75 100644
--- a/Facebook.Unity/Utils/MiniJson.cs
+++ b/Facebook.Unity/Utils/MiniJson.cs
@@ -615,7 +615,7 @@ private void SerializeOther(object value)
                 }
                 else
                 {
-                    this.SerializeString(value.ToString());
+                    this.builder.Append(UnityEngine.JsonUtility.ToJson(value));
                 }
             }
         }