diff --git a/sign/pdfvisualsignature.go b/sign/pdfvisualsignature.go
index 43d5df3..806cc6a 100644
--- a/sign/pdfvisualsignature.go
+++ b/sign/pdfvisualsignature.go
@@ -156,7 +156,12 @@ func (context *SignContext) createIncPageUpdate(pageNumber, annot uint32) ([]byt
 			page_buffer.WriteString(fmt.Sprintf("    %d 0 R\n", annot))
 			page_buffer.WriteString("  ]\n")
 		default:
-			page_buffer.WriteString(fmt.Sprintf("  /%s %s\n", key, page.Key(key).String()))
+			val := page.Key(key)
+			if val.Kind() == pdf.String {
+				page_buffer.WriteString(fmt.Sprintf("  /%s %s\n", key, pdfString(val.RawString())))
+			} else {
+				page_buffer.WriteString(fmt.Sprintf("  /%s %s\n", key, val.String()))
+			}
 		}
 	}