diff --git a/kernel/fork.c b/kernel/fork.c
index e87aaaa..3b159c5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -908,6 +908,8 @@
 	sig->oom_adj = current->signal->oom_adj;
 	sig->oom_score_adj = current->signal->oom_score_adj;
 
+	mutex_init(&sig->cred_guard_mutex);
+
 	return 0;
 }