diff --git a/ArduCopter/config.h b/ArduCopter/config.h
index 52f8bda17d..296c42448f 100644
--- a/ArduCopter/config.h
+++ b/ArduCopter/config.h
@@ -724,6 +724,7 @@
 // Attitude Control
 //
 
+// Acro mode gains
 #ifndef ACRO_P
  # define ACRO_P                 4.5f
 #endif
@@ -979,9 +980,6 @@
 #ifndef LOG_NTUN
  # define LOG_NTUN                      ENABLED
 #endif
-#ifndef LOG_MODE
- # define LOG_MODE                      ENABLED
-#endif
 #ifndef LOG_IMU
  # define LOG_IMU                       DISABLED
 #endif
@@ -1023,7 +1021,6 @@
     LOGBIT(PM)              | \
     LOGBIT(CTUN)            | \
     LOGBIT(NTUN)            | \
-    LOGBIT(MODE)            | \
     LOGBIT(IMU)             | \
     LOGBIT(CMD)             | \
     LOGBIT(CURRENT)         | \
diff --git a/ArduCopter/defines.h b/ArduCopter/defines.h
index 0026ee6208..9606ae0045 100644
--- a/ArduCopter/defines.h
+++ b/ArduCopter/defines.h
@@ -291,7 +291,7 @@ enum ap_message {
 #define MASK_LOG_PM                     (1<<3)
 #define MASK_LOG_CTUN                   (1<<4)
 #define MASK_LOG_NTUN                   (1<<5)
-#define MASK_LOG_MODE                   (1<<6)
+#define MASK_LOG_MODE                   (1<<6)  // not used
 #define MASK_LOG_IMU                    (1<<7)
 #define MASK_LOG_CMD                    (1<<8)
 #define MASK_LOG_CURRENT                (1<<9)