diff --git a/src/utils/pdf.ts b/src/utils/pdf.ts
index 1dd75f6..7803d91 100644
--- a/src/utils/pdf.ts
+++ b/src/utils/pdf.ts
@@ -1,12 +1,14 @@
 import { PdfPage } from '../types/drawing.ts'
-import * as PDFJS from 'pdfjs-dist'
 import { PDFDocument } from 'pdf-lib'
 import { Mark } from '../types/mark.ts'
 
-PDFJS.GlobalWorkerOptions.workerSrc = new URL(
-  'pdfjs-dist/build/pdf.worker.min.mjs',
-  import.meta.url
-).toString()
+import * as PDFJS from 'pdfjs-dist'
+import PDFJSWorker from 'pdfjs-dist/build/pdf.worker.mjs?worker'
+if (!PDFJS.GlobalWorkerOptions.workerPort) {
+  // Use workerPort and allow worker to be shared between all getDocument calls
+  const worker = new PDFJSWorker()
+  PDFJS.GlobalWorkerOptions.workerPort = worker
+}
 
 /**
  * Defined font size used when generating a PDF. Currently it is difficult to fully