diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 752b75b..a6708e67 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -211,7 +211,7 @@
 };
 
 /* Callback function for perf event subsystem */
-static void watchdog_overflow_callback(struct perf_event *event, int nmi,
+static void watchdog_overflow_callback(struct perf_event *event,
 		 struct perf_sample_data *data,
 		 struct pt_regs *regs)
 {