diff --git a/app/xenodm/xenodm/dm.c b/app/xenodm/xenodm/dm.c
index 1eaa0e9f1..d2f3d8850 100644
--- a/app/xenodm/xenodm/dm.c
+++ b/app/xenodm/xenodm/dm.c
@@ -616,7 +616,7 @@ StartDisplay (struct display *d)
 	if (!WaitForServer (d))
 	    exit (OPENFAILED_DISPLAY);
 	SetWindowPath(d);
-	if (pledge("stdio rpath cpath wpath fattr proc dns inet unix exec prot_exec getpw id", NULL) != 0)
+	if (pledge("stdio rpath cpath wpath fattr flock proc dns inet unix exec prot_exec getpw id", NULL) != 0)
 	    exit(OPENFAILED_DISPLAY);
 	ManageSession (d);
 	exit (REMANAGE_DISPLAY);