diff --git a/src/cpu/samsung/exynos5420/clock.c b/src/cpu/samsung/exynos5420/clock.c
index b75540e099..11e46d1b52 100644
--- a/src/cpu/samsung/exynos5420/clock.c
+++ b/src/cpu/samsung/exynos5420/clock.c
@@ -359,7 +359,7 @@ void clock_ll_set_ratio(enum periph_id periph_id, unsigned divisor)
 {
 	struct exynos5420_clock *clk = samsung_get_base_clock();
 	unsigned shift;
-	unsigned mask = 0xff;
+	unsigned mask = 0xf;
 	u32 *reg;
 
 	switch (periph_id) {