diff --git a/Modules.Interfaces/ZUGFeRDInterface/PDFAttachments.vb b/Modules.Interfaces/ZUGFeRDInterface/PDFAttachments.vb
index d2382f37..1ee220ae 100644
--- a/Modules.Interfaces/ZUGFeRDInterface/PDFAttachments.vb
+++ b/Modules.Interfaces/ZUGFeRDInterface/PDFAttachments.vb
@@ -77,7 +77,7 @@ Public Class PDFAttachments
         End Try
     End Function
 
-    Private Function DoExtract(GDPicturePDF As GdPicturePDF, Extensions As List(Of String)) As List(Of AttachmentResult)
+    Private Function DoExtract(GDPicturePDF As GdPicturePDF, pExtensions As List(Of String)) As List(Of AttachmentResult)
         Dim oResults As New List(Of AttachmentResult)
         Dim oEmbeddedFileCount As Integer = GDPicturePDF.GetEmbeddedFileCount()
 
@@ -92,7 +92,7 @@ Public Class PDFAttachments
                         Logger.Debug("Extracting embedded file [{0}]", oFileName)
 
                         Dim oExtension = New FileInfo(oFileName).Extension.ToUpper.Substring(1)
-                        If Extensions.Contains(oExtension) Then
+                        If pExtensions.Contains(oExtension) Then
                             Dim oFileSize As Integer = GDPicturePDF.GetEmbeddedFileSize(oIndex)
 
                             If GDPicturePDF.GetStat() = GdPictureStatus.OK Then