diff --git a/src/soc/rockchip/rk3399/include/soc/mipi.h b/src/soc/rockchip/rk3399/include/soc/mipi.h
index 2dfbc521d2..bccaf287d3 100644
--- a/src/soc/rockchip/rk3399/include/soc/mipi.h
+++ b/src/soc/rockchip/rk3399/include/soc/mipi.h
@@ -197,7 +197,7 @@ check_member(rk_mipi_regs, dsi_int_msk1, 0xc8);
 #define LOW_PROGRAM_EN		0
 #define HIGH_PROGRAM_EN		BIT(7)
 #define LOOP_DIV_LOW_SEL(val)	((val - 1) & 0x1f)
-#define LOOP_DIV_HIGH_SEL(val)	(((val - 1) >> 5) & 0x1f)
+#define LOOP_DIV_HIGH_SEL(val)	(((val - 1) >> 5) & 0xf)
 #define PLL_LOOP_DIV_EN		BIT(5)
 #define PLL_INPUT_DIV_EN	BIT(4)