diff --git a/src/mapping/json/asset/IAssetData.ts b/src/mapping/json/asset/IAssetData.ts
index bbfa575..2af33ca 100644
--- a/src/mapping/json/asset/IAssetData.ts
+++ b/src/mapping/json/asset/IAssetData.ts
@@ -13,7 +13,7 @@ export interface IAssetData {
     logicType?: string;
     maskType?: string;
     credits?: string;
-    soundSample: number;
+    soundSample?: number;
     action?: { link?: string, startState?: number };
     spritesheet?: ISpritesheetData;
     dimensions?: IAssetDimension;