diff --git a/targets/arduino/wiring.h b/targets/arduino/wiring.h
index c4ba02382..6cbfd132e 100755
--- a/targets/arduino/wiring.h
+++ b/targets/arduino/wiring.h
@@ -45,10 +45,10 @@ extern "C"{
 #define SERIAL  0x0
 #define DISPLAY 0x1
 
-#define min(a,b) ((a<b)?(a):(b))
-#define max(a,b) ((a>b)?(a):(b))
-#define abs(x) ((x>0)?(x):(-x))
-#define constrain(amt,low,high) ((amt<low)?(low):((amt>high)?(high):(amt)))
+#define min(a,b) ((a)<(b)?(a):(b))
+#define max(a,b) ((a)>(b)?(a):(b))
+#define abs(x) ((x)>0?(x):-(x))
+#define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
 #define radians(deg) ((deg)*DEG_TO_RAD)
 #define degrees(rad) ((rad)*RAD_TO_DEG)
 #define sq(x) ((x)*(x))