diff --git a/javascript/src/utilities/pdfUtilities.js b/javascript/src/utilities/pdfUtilities.js
index caa9764c372f65ec97e0d69b06e38e91812b5039..543fd2ff860355f2a0cc777a63b698e8b5d22086 100644
--- a/javascript/src/utilities/pdfUtilities.js
+++ b/javascript/src/utilities/pdfUtilities.js
@@ -331,9 +331,9 @@ async function sha256(array) {
 }
 
 function isSigInRoot(pdf) {
-    if (typeof pdf.acroForm === 'undefined') {
-        return false;
-    }
+  if (!pdf.acroForm) {
+    return false;
+  }
     return pdf.acroForm.get('SigFlags') === 3;
 }