diff --git a/ArduCopter/defines.h b/ArduCopter/defines.h
index 18b54fb577..632324debe 100644
--- a/ArduCopter/defines.h
+++ b/ArduCopter/defines.h
@@ -283,10 +283,10 @@ enum gcs_severity {
 #define TYPE_GROUNDSTART_MSG            0x01
 #define LOG_ATTITUDE_MSG                0x01
 #define LOG_GPS_MSG                     0x02
-#define LOG_MODE_MSG                    0X03
-#define LOG_CONTROL_TUNING_MSG          0X04
-#define LOG_NAV_TUNING_MSG              0X05
-#define LOG_PERFORMANCE_MSG             0X06
+#define LOG_MODE_MSG                    0x03
+#define LOG_CONTROL_TUNING_MSG          0x04
+#define LOG_NAV_TUNING_MSG              0x05
+#define LOG_PERFORMANCE_MSG             0x06
 #define LOG_RAW_MSG                     0x07
 #define LOG_CMD_MSG                     0x08
 #define LOG_CURRENT_MSG                 0x09