diff --git a/AK8975_FS/akmdfs/AK8975Driver.h b/AK8975_FS/akmdfs/AK8975Driver.h
index 2f226ac..a09610a 100644
--- a/AK8975_FS/akmdfs/AK8975Driver.h
+++ b/AK8975_FS/akmdfs/AK8975Driver.h
@@ -27,7 +27,7 @@
 #define AKD_FALSE	0		/*!< Represents false */
 #define AKD_SUCCESS	1		/*!< Represents success.*/
 #define AKD_FAIL	0		/*!< Represents fail. */
-#define AKD_ERROR	-1		/*!< Represents error. */
+#define AKD_ERROR	(-1)		/*!< Represents error. */
 
 /*! 0:Don't Output data, 1:Output data */
 #define AKD_DBG_DATA	0
diff --git a/AK8975_FS/akmdfs/AKFS_Common.h b/AK8975_FS/akmdfs/AKFS_Common.h
index 4b6874d..cd1ed52 100644
--- a/AK8975_FS/akmdfs/AKFS_Common.h
+++ b/AK8975_FS/akmdfs/AKFS_Common.h
@@ -113,7 +113,7 @@
 /***** Dbg Zone Output ***************************************/
 #if ENABLE_AKMDEBUG
 #define AKMDATA(flag, format, ...)  \
-	((((int)flag) & g_dbgzone) \
+	((((int)(flag)) & g_dbgzone) \
 	  ? (fprintf(stdout, (format), ##__VA_ARGS__)) \
 	  : ((void)0))
 #else
diff --git a/AK8975_FS/akmdfs/AKFS_Measure.h b/AK8975_FS/akmdfs/AKFS_Measure.h
index c41e363..1f001ac 100644
--- a/AK8975_FS/akmdfs/AKFS_Measure.h
+++ b/AK8975_FS/akmdfs/AKFS_Measure.h
@@ -23,14 +23,14 @@
 #include "AKFS_Compass.h"
 
 /*** Constant definition ******************************************************/
-#define AK8975_SELFTEST_MIN_X	-100
+#define AK8975_SELFTEST_MIN_X	(-100)
 #define AK8975_SELFTEST_MAX_X	100
 
-#define AK8975_SELFTEST_MIN_Y	-100
+#define AK8975_SELFTEST_MIN_Y	(-100)
 #define AK8975_SELFTEST_MAX_Y	100
 
-#define AK8975_SELFTEST_MIN_Z	-1000
-#define AK8975_SELFTEST_MAX_Z	-300
+#define AK8975_SELFTEST_MIN_Z	(-1000)
+#define AK8975_SELFTEST_MAX_Z	(-300)
 
 #define CONVERT_ACC(a)	((int)((a) * 720 / 9.8f))
 #define CONVERT_MAG(m)	((int)((m) / 0.06f))
diff --git a/AK8975_FS/libsensors/sensors.h b/AK8975_FS/libsensors/sensors.h
index 6060e6a..ed33092 100644
--- a/AK8975_FS/libsensors/sensors.h
+++ b/AK8975_FS/libsensors/sensors.h
@@ -31,7 +31,7 @@
 
 /*****************************************************************************/
 
-#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
 
 #define ID_A  (0)
 #define ID_M  (1)