diff --git a/drivers/clk/rockchip/clk-px30.c b/drivers/clk/rockchip/clk-px30.c
index 733018ecd213..7b9c3f68d7b6 100644
--- a/drivers/clk/rockchip/clk-px30.c
+++ b/drivers/clk/rockchip/clk-px30.c
@@ -123,7 +123,7 @@ static struct rockchip_cpuclk_rate_table px30_cpuclk_rates[] __initdata = {
 static const struct rockchip_cpuclk_reg_data px30_cpuclk_data = {
 	.core_reg = PX30_CLKSEL_CON(0),
 	.div_core_shift = 0,
-	.div_core_mask = 0x1f,
+	.div_core_mask = 0xf,
 	.mux_core_alt = 1,
 	.mux_core_main = 0,
 	.mux_core_shift = 7,