diff --git a/kernel/trace/preemptirq_delay_test.c b/kernel/trace/preemptirq_delay_test.c
index c97a026c07205139bc5c6e5cba31786e8acea76e..f704390db9fcdf596700313c536451479f79e7ef 100644
--- a/kernel/trace/preemptirq_delay_test.c
+++ b/kernel/trace/preemptirq_delay_test.c
@@ -34,7 +34,7 @@ static void busy_wait(ulong time)
 	} while (ktime_to_ns(ktime_sub(end, start)) < (time * 1000));
 }
 
-int preemptirq_delay_run(void *data)
+static int preemptirq_delay_run(void *data)
 {
 	unsigned long flags;