diff --git a/include/common/tdataformat.h b/include/common/tdataformat.h
index bc29f3b59c5b9041bb0a64320876acdc7c2c6e58..e94edfcb1eeefc9fe1fb23b6a65accbce3907ab6 100644
--- a/include/common/tdataformat.h
+++ b/include/common/tdataformat.h
@@ -48,8 +48,8 @@ const static uint8_t BIT2_MAP[4][4] = {{0b00000000, 0b00000001, 0b00000010, 0},
                                        {0b00001111, 0b00011111, 0b00101111, 4},
                                        {0b00111111, 0b01111111, 0b10111111, 6}};
 
-#define BIT1_SIZE(n)      (((n)-1) >> 3 + 1)
-#define BIT2_SIZE(n)      (((n)-1) >> 2 + 1)
+#define BIT1_SIZE(n)      ((((n)-1) >> 3) + 1)
+#define BIT2_SIZE(n)      ((((n)-1) >> 2) + 1)
 #define SET_BIT1(p, i, v) ((p)[(i) >> 3] &= BIT1_MAP[(i)&7][v])
 #define GET_BIT1(p, i)    (((p)[(i) >> 3] >> ((i)&7)) & ((uint8_t)1))
 #define SET_BIT2(p, i, v) ((p)[(i) >> 2] &= BIT2_MAP[(i)&3][v])