diff --git a/fs/proc/array.c b/fs/proc/array.c
index 70e4fab..07c9cdb 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -351,7 +351,7 @@
 		struct signal_struct *sig = task->signal;
 
 		if (sig->tty) {
-			tty_pgrp = sig->tty->pgrp;
+			tty_pgrp = pid_nr(sig->tty->pgrp);
 			tty_nr = new_encode_dev(tty_devnum(sig->tty));
 		}