diff --git a/fs/coredump.c b/fs/coredump.c
index 0b2528fb640e77e4a38a351c51f8a01f12102c14..a93f7e6ea4cf935aea64e8266b221a2c53477628 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -306,7 +306,7 @@ static int zap_threads(struct task_struct *tsk, struct mm_struct *mm,
 	if (unlikely(nr < 0))
 		return nr;
 
-	tsk->flags = PF_DUMPCORE;
+	tsk->flags |= PF_DUMPCORE;
 	if (atomic_read(&mm->mm_users) == nr + 1)
 		goto done;
 	/*