diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
index 5449d9150d40d245fdd2380ca291ca53aa2b0b31..183225e41d604210d8283df3119caf94f4b3e5c5 100644
--- a/drivers/pwm/pwm-imx.c
+++ b/drivers/pwm/pwm-imx.c
@@ -32,7 +32,7 @@
 #define MX3_PWMCR                 0x00    /* PWM Control Register */
 #define MX3_PWMSAR                0x0C    /* PWM Sample Register */
 #define MX3_PWMPR                 0x10    /* PWM Period Register */
-#define MX3_PWMCR_PRESCALER(x)    (((x - 1) & 0xFFF) << 4)
+#define MX3_PWMCR_PRESCALER(x)    ((((x) - 1) & 0xFFF) << 4)
 #define MX3_PWMCR_DOZEEN                (1 << 24)
 #define MX3_PWMCR_WAITEN                (1 << 23)
 #define MX3_PWMCR_DBGEN			(1 << 22)