diff --git a/lisp/gnus/message.el b/lisp/gnus/message.el
index 935ea9bba68..133f8424aea 100644
--- a/lisp/gnus/message.el
+++ b/lisp/gnus/message.el
@@ -8887,7 +8887,8 @@ used to take the screenshot."
 	       (set-buffer-multibyte nil)
 	       (insert image)
 	       (base64-encode-region (point-min) (point-max) t)
-	       (buffer-string))))
+	       (buffer-string)))
+     nil nil t)
     (insert "\n\n")
     (message "")))