diff --git a/chip/mec1322/lfw/ec_lfw.c b/chip/mec1322/lfw/ec_lfw.c
index 997e41aa0b..cb690fb3e1 100644
--- a/chip/mec1322/lfw/ec_lfw.c
+++ b/chip/mec1322/lfw/ec_lfw.c
@@ -202,16 +202,23 @@ void uart_init(void)
 void system_init(void)
 {
 
-	uint32_t status = MEC1322_VBAT_STS;
 	uint32_t wdt_cnt = MEC1322_EC_WDT_CNT;
+	uint32_t rst_sts = MEC1322_PCR_CHIP_PWR_RST &
+				(MEC1322_PWR_RST_STS_VCC1 |
+				 MEC1322_PWR_RST_STS_VBAT);
 
-	/* Reset the image type if reset cause is power-on */
-	if (status & (1 << 7) || (wdt_cnt == 0))
+	/*
+	 * BIT[6:5] determine VCC1 reset and VBAT reset status.
+	 * when Poweron watchdog is reset and both VCC1 and VBAT
+	 * are set
+	 */
+	if ((rst_sts == (MEC1322_PWR_RST_STS_VCC1 |
+			 MEC1322_PWR_RST_STS_VBAT))
+			 && (wdt_cnt == 0))
 		MEC1322_VBAT_RAM(MEC1322_IMAGETYPE_IDX)
 					= SYSTEM_IMAGE_UNKNOWN;
 }
 
-
 enum system_image_copy_t system_get_image_copy(void)
 {
 	return MEC1322_VBAT_RAM(MEC1322_IMAGETYPE_IDX);