diff --git a/optipdf b/optipdf
index b2db85d..f62e67b 100755
--- a/optipdf
+++ b/optipdf
@@ -43,6 +43,12 @@ for ARG; do
             --no-lossy)
                 LOSSY=0
                 ;;
+            --preserve-timestamp)
+                PRESERVE_TIMESTAMP=1
+                ;;
+            --no-preserve-timestamp)
+                PRESERVE_TIMESTAMP=0
+                ;;
             --)
                 NO_MORE_FLAGS=1
                 ;;