diff --git a/kernel/fork.c b/kernel/fork.c
index 88ef51c..341965b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -553,6 +553,8 @@
 		tsk->compat_robust_list = NULL;
 	}
 #endif
+	if (unlikely(!list_empty(&tsk->pi_state_list)))
+		exit_pi_state_list(tsk);
 #endif
 
 	/* Get rid of any cached register state */