diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index cda716ce84be..523d26e2ee87 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -577,6 +577,7 @@ static int exynos5433_tmu_initialize(struct platform_device *pdev)
 		threshold_code = temp_to_code(data, temp);
 
 		rising_threshold = readl(data->base + rising_reg_offset);
+		rising_threshold &= ~(0xff << j * 8);
 		rising_threshold |= (threshold_code << j * 8);
 		writel(rising_threshold, data->base + rising_reg_offset);