diff --git a/src/datasource/load_data.ts b/src/datasource/load_data.ts
index 2544f4b..67bc278 100644
--- a/src/datasource/load_data.ts
+++ b/src/datasource/load_data.ts
@@ -93,7 +93,7 @@ async function loadGedzip(
         const normalizedKey = fileName.replace(/\\/g, '/').toLowerCase();
         images.set(
           normalizedKey,
-          URL.createObjectURL(new Blob([unzipped[fileName]])),
+          URL.createObjectURL(new Blob([unzipped[fileName] as BlobPart])),
         );
       }
     }