diff --git a/src/book.js b/src/book.js
index a5c9a15..9b2520a 100644
--- a/src/book.js
+++ b/src/book.js
@@ -584,7 +584,7 @@ export class Book {
           rotate: degrees(rotation),
         });
       } else {
-        console.error("Unexpected type for page: ", page);
+        console.error('Unexpected type for page: ', page);
       }
 
       if (pdfEdgeMarks && (sigDetails[i].isSigStart || sigDetails[i].isSigEnd)) {