diff --git a/src/UglyToad.PdfPig/Parser/PdfDocumentFactory.cs b/src/UglyToad.PdfPig/Parser/PdfDocumentFactory.cs
index 9fb89c238..613a0a5de 100644
--- a/src/UglyToad.PdfPig/Parser/PdfDocumentFactory.cs
+++ b/src/UglyToad.PdfPig/Parser/PdfDocumentFactory.cs
@@ -44,10 +44,10 @@ public static PdfDocument Open(string filename, ParsingOptions? options = null)
 
         internal static PdfDocument Open(Stream stream, ParsingOptions? options)
         {
-            var initialPosition = stream.Position;
-
             var streamInput = new StreamInputBytes(stream, false);
 
+            var initialPosition = stream.Position;
+
             try
             {
                 return Open(streamInput, options);