diff --git a/drivers/hwmon/aspeed-pwm-tacho.c b/drivers/hwmon/aspeed-pwm-tacho.c
index 69b97d45e3cbb459ccdf73321dc4c3ef8ae23488..f914e5f410483c8e5e03f618bf2211dec3658c2f 100644
--- a/drivers/hwmon/aspeed-pwm-tacho.c
+++ b/drivers/hwmon/aspeed-pwm-tacho.c
@@ -161,7 +161,7 @@
  * 11: reserved.
  */
 #define M_TACH_MODE 0x02 /* 10b */
-#define M_TACH_UNIT 0x00c0
+#define M_TACH_UNIT 0x0210
 #define INIT_FAN_CTRL 0xFF
 
 /* How long we sleep in us while waiting for an RPM result. */