diff --git a/lib/mu-msg-part.c b/lib/mu-msg-part.c
index 5d244417..be803c5f 100644
--- a/lib/mu-msg-part.c
+++ b/lib/mu-msg-part.c
@@ -610,7 +610,7 @@ write_part_to_fd (GMimePart *part, int fd, GError **err)
 	} else
 		rv = TRUE;
 
-	g_object_unref (wrapper);
+	/* g_object_unref (wrapper); we don't own it */
 	g_object_unref (stream);
 
 	return rv;