diff --git a/src/core/iTextSharp/text/pdf/PdfStamperImp.cs b/src/core/iTextSharp/text/pdf/PdfStamperImp.cs
index b8a277cc..0dd68edb 100644
--- a/src/core/iTextSharp/text/pdf/PdfStamperImp.cs
+++ b/src/core/iTextSharp/text/pdf/PdfStamperImp.cs
@@ -208,12 +208,6 @@ internal void Close(Hashtable moreInfo) {
             if (producer == null) {
                 producer = Document.Version;
             }
-            else if (producer.IndexOf(Document.Product) == -1) {
-                StringBuilder buf = new StringBuilder(producer);
-                buf.Append("; modified using ");
-                buf.Append(Document.Version);
-                producer = buf.ToString();
-            }
             // XMP
             byte[] altMetadata = null;
             PdfObject xmpo = PdfReader.GetPdfObject(catalog.Get(PdfName.METADATA));