diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index cf265ab03..68f192bd1 100755
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -38,7 +38,7 @@
 
 #define PLL_USER_CTL(p)		((p)->offset + (p)->regs[PLL_OFF_USER_CTL])
 # define PLL_POST_DIV_SHIFT	8
-# define PLL_POST_DIV_MASK(p)	GENMASK((p)->width, 0)
+# define PLL_POST_DIV_MASK(p)	GENMASK((p)->width - 1, 0)
 # define PLL_ALPHA_EN		BIT(24)
 # define PLL_ALPHA_MODE		BIT(25)
 # define PLL_VCO_SHIFT		20