diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index 89979ff10e27..47b2b227c91e 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -47,7 +47,7 @@ struct rcar_thermal_priv {
 };
 
 #define MCELSIUS(temp)			((temp) * 1000)
-#define rcar_zone_to_priv(zone)		(zone->devdata)
+#define rcar_zone_to_priv(zone)		((zone)->devdata)
 
 /*
  *		basic functions