diff --git a/src/core/document.js b/src/core/document.js
index d777d0ab9..e6202294d 100644
--- a/src/core/document.js
+++ b/src/core/document.js
@@ -1408,7 +1408,7 @@ class PDFDocument {
     this.xfaFactory.appendFonts(pdfFonts, reallyMissingFonts);
   }
 
-  async serializeXfaData(annotationStorage) {
+  serializeXfaData(annotationStorage) {
     return this.xfaFactory
       ? this.xfaFactory.serializeData(annotationStorage)
       : null;
diff --git a/src/core/pdf_manager.js b/src/core/pdf_manager.js
index 0246c26bf..cac6c3c5e 100644
--- a/src/core/pdf_manager.js
+++ b/src/core/pdf_manager.js
@@ -123,10 +123,6 @@ class BasePdfManager {
     return this.pdfDocument.loadXfaImages();
   }
 
-  serializeXfaData(annotationStorage) {
-    return this.pdfDocument.serializeXfaData(annotationStorage);
-  }
-
   cleanup(manuallyTriggered = false) {
     return this.pdfDocument.cleanup(manuallyTriggered);
   }
diff --git a/src/core/worker.js b/src/core/worker.js
index eb51bacfa..66fa9ae15 100644
--- a/src/core/worker.js
+++ b/src/core/worker.js
@@ -617,7 +617,9 @@ class WorkerMessageHandler {
         }
 
         if (isPureXfa) {
-          promises.push(pdfManager.serializeXfaData(annotationStorage));
+          promises.push(
+            pdfManager.ensureDoc("serializeXfaData", [annotationStorage])
+          );
         } else {
           for (let pageIndex = 0; pageIndex < numPages; pageIndex++) {
             promises.push(