diff --git a/web/app.js b/web/app.js
index 046f498ee..5fd9ce616 100644
--- a/web/app.js
+++ b/web/app.js
@@ -1481,7 +1481,7 @@ const PDFViewerApplication = {
     console.log(
       `PDF ${pdfDocument.fingerprints[0]} [${info.PDFFormatVersion} ` +
         `${(info.Producer || "-").trim()} / ${(info.Creator || "-").trim()}] ` +
-        `(PDF.js: ${version || "-"})`
+        `(PDF.js: ${version || "?"} [${build || "?"}])`
     );
     let pdfTitle = info.Title;