diff --git a/utils/epub/asset.ts b/utils/epub/asset.ts
index bc62c6d2..ccfbb094 100644
--- a/utils/epub/asset.ts
+++ b/utils/epub/asset.ts
@@ -57,7 +57,7 @@ export const ISCN_XHTML = `<?xml version="1.0" encoding="utf-8"?>
   <div id="iscn-page-body">
     <div id="iscn-page-book-info" />
     <div id="iscn-qr-code">
-      <img src="iscn-qr-code.png" width="180px" height="180px" />
+      <img src="iscn-qr-code.png" width="180" height="180" />
       <br />
       <a id="iscn-prefix" />
     </div>
diff --git a/utils/epub/iscn.ts b/utils/epub/iscn.ts
index 3c971110..90d27924 100644
--- a/utils/epub/iscn.ts
+++ b/utils/epub/iscn.ts
@@ -165,6 +165,9 @@ export async function injectISCNQRCodePage(buffer: ArrayBuffer, book: Book, iscn
   const updatedISCNXHTMLString = new XMLSerializer().serializeToString(iscnXHTMLDoc).toString()
 
   await zipObject.file(iscnXHTMLPath, updatedISCNXHTMLString)
+  await zipObject.file('mimetype', 'application/epub+zip', {
+    compression: 'STORE',
+  });
   const epubBlob = await zipObject.generateAsync({
     mimeType: 'application/epub+zip',
     type: 'blob',