diff --git a/post/board/lwmon5/watchdog.c b/post/board/lwmon5/watchdog.c
index 16c01be..1246278 100644
--- a/post/board/lwmon5/watchdog.c
+++ b/post/board/lwmon5/watchdog.c
@@ -52,8 +52,9 @@
 
 int sysmon1_post_test(int flags)
 {
-	if (gpio_read_in_bit(CFG_GPIO_SYSMON_STATUS)) {
-		/* 3.1. GPIO62 is low
+	if (gpio_read_in_bit(CFG_GPIO_SYSMON_STATUS) == 0) {
+		/*
+		 * 3.1. GPIO62 is low
 		 * Assuming system voltage failure.
 		 */
 		post_log("Abnormal voltage detected (GPIO62)\n");