diff --git a/Assets/FlashTools/Scripts/FTRuntime/SwfAsset.cs b/Assets/FlashTools/Scripts/FTRuntime/SwfAsset.cs
index 5418af7..1673072 100644
--- a/Assets/FlashTools/Scripts/FTRuntime/SwfAsset.cs
+++ b/Assets/FlashTools/Scripts/FTRuntime/SwfAsset.cs
@@ -3,6 +3,7 @@ using FTRuntime.Internal;
 using System.Collections.Generic;
 
 namespace FTRuntime {
+	[PreferBinarySerialization]
 	public class SwfAsset : ScriptableObject {
 		[HideInInspector]
 		public byte[]          Data;
diff --git a/Assets/FlashTools/Scripts/FTRuntime/SwfClipAsset.cs b/Assets/FlashTools/Scripts/FTRuntime/SwfClipAsset.cs
index afd0f39..df0f818 100644
--- a/Assets/FlashTools/Scripts/FTRuntime/SwfClipAsset.cs
+++ b/Assets/FlashTools/Scripts/FTRuntime/SwfClipAsset.cs
@@ -3,6 +3,7 @@ using FTRuntime.Internal;
 using System.Collections.Generic;
 
 namespace FTRuntime {
+	[PreferBinarySerialization]
 	public class SwfClipAsset : ScriptableObject {
 		[System.Serializable]
 		public class SubMeshData {