diff --git a/applications/uk.ewsgit.files/electron/src/main.ts b/applications/uk.ewsgit.files/electron/src/main.ts
index df9360c..29cdf4e 100644
--- a/applications/uk.ewsgit.files/electron/src/main.ts
+++ b/applications/uk.ewsgit.files/electron/src/main.ts
@@ -110,7 +110,7 @@ app.whenReady().then(async () => {
           // TODO: implement sharing first
           shared: false,
           size: itemStats.size,
-          thumbnail: thumbnail ? `data:image/${path.extname(resolvedPath)};base64,${thumbnail}` : undefined,
+          thumbnail: thumbnail ? `data:image/${path.extname(resolvedPath)};base64,${thumbnail.toBase64()}` : undefined,
         },
       };
     } catch (_) {