diff --git a/drivers/clk/sunxi/clk-factors.c b/drivers/clk/sunxi/clk-factors.c
index 88523f91d9b703cc57b1272421fed39430b6f7a6..5687ac9bd85a8ffb087fbd022292a856828ac497 100644
--- a/drivers/clk/sunxi/clk-factors.c
+++ b/drivers/clk/sunxi/clk-factors.c
@@ -40,7 +40,7 @@ struct clk_factors {
 
 #define to_clk_factors(_hw) container_of(_hw, struct clk_factors, hw)
 
-#define SETMASK(len, pos)		(((-1U) >> (31-len))  << (pos))
+#define SETMASK(len, pos)		(((1U << (len)) - 1) << (pos))
 #define CLRMASK(len, pos)		(~(SETMASK(len, pos)))
 #define FACTOR_GET(bit, len, reg)	(((reg) & SETMASK(len, bit)) >> (bit))