diff --git a/libraries/AP_ADC/AP_ADC_HIL.cpp b/libraries/AP_ADC/AP_ADC_HIL.cpp
index 24587de2f4..2cf0811157 100644
--- a/libraries/AP_ADC/AP_ADC_HIL.cpp
+++ b/libraries/AP_ADC/AP_ADC_HIL.cpp
@@ -1,46 +1,46 @@
 #include "AP_ADC_HIL.h"
 #if defined(ARDUINO) && ARDUINO >= 100
-	#include "Arduino.h"
+ #include "Arduino.h"
 #else
-	#include "WProgram.h"
+ #include "WProgram.h"
 #endif
 
 /*
-	AP_ADC_HIL.cpp
-	Author: James Goppert
-
-	License:
-	This library is free software; you can redistribute it and/or
-	modify it under the terms of the GNU Lesser General Public
-	License as published by the Free Software Foundation; either
-	version 2.1 of the License, or (at your option) any later version.
-*/
+ *       AP_ADC_HIL.cpp
+ *       Author: James Goppert
+ *
+ *       License:
+ *       This library is free software; you can redistribute it and/or
+ *       modify it under the terms of the GNU Lesser General Public
+ *       License as published by the Free Software Foundation; either
+ *       version 2.1 of the License, or (at your option) any later version.
+ */
 
 const uint8_t AP_ADC_HIL::sensors[6] = {1,2,0,4,5,6};
-const int8_t AP_ADC_HIL::sensorSign[6]	= { 1, -1, -1,-1,  1,  1};
-const float AP_ADC_HIL::gyroBias[3]	= {1665,1665,1665};
-const float AP_ADC_HIL::accelBias[3]	= {2025,2025,2025};
+const int8_t AP_ADC_HIL::sensorSign[6]  = { 1, -1, -1,-1,  1,  1};
+const float AP_ADC_HIL::gyroBias[3]     = {1665,1665,1665};
+const float AP_ADC_HIL::accelBias[3]    = {2025,2025,2025};
 // gyroScale = 1/[GyroGain*pi/180]   GyroGains (0.4,0.41,0.41)
 const float AP_ADC_HIL::gyroScale[3] = {143.239, 139.746, 139.746};
 const float AP_ADC_HIL::accelScale[3] = {418,418,418}; // adcPerG
 
 AP_ADC_HIL::AP_ADC_HIL()
 {
-	// gyros set to zero for calibration
-	setGyro(0,0);
-	setGyro(1,0);
-	setGyro(2,0);
+    // gyros set to zero for calibration
+    setGyro(0,0);
+    setGyro(1,0);
+    setGyro(2,0);
 
-	// accels set to zero for calibration
-	setAccel(0,0);
-	setAccel(1,0);
-	setAccel(2,0);
+    // accels set to zero for calibration
+    setAccel(0,0);
+    setAccel(1,0);
+    setAccel(2,0);
 
-	// set diff press and temp to zero
-	setGyroTemp(0);
-	setPressure(0);
+    // set diff press and temp to zero
+    setGyroTemp(0);
+    setPressure(0);
 
-	last_hil_time = millis();
+    last_hil_time = millis();
 }
 
 void AP_ADC_HIL::Init( AP_PeriodicProcess * scheduler )
@@ -50,41 +50,41 @@ void AP_ADC_HIL::Init( AP_PeriodicProcess * scheduler )
 // Read one channel value
 float AP_ADC_HIL::Ch(unsigned char ch_num)
 {
-	return adcValue[ch_num];
+    return adcValue[ch_num];
 }
 
 // Read 6 channel values
 uint32_t AP_ADC_HIL::Ch6(const uint8_t *channel_numbers, float *result)
 {
-	for (uint8_t i=0; i<6; i++) {
-		result[i] = Ch(channel_numbers[i]);
-	}
-	return ((millis() - last_hil_time)*2)/5;
+    for (uint8_t i=0; i<6; i++) {
+        result[i] = Ch(channel_numbers[i]);
+    }
+    return ((millis() - last_hil_time)*2)/5;
 }
 
 // Set one channel value
 void AP_ADC_HIL::setHIL(int16_t p, int16_t q, int16_t r, int16_t gyroTemp,
-    int16_t aX, int16_t aY, int16_t aZ, int16_t diffPress)
+                        int16_t aX, int16_t aY, int16_t aZ, int16_t diffPress)
 {
     // gyros
-	setGyro(0,p);
-	setGyro(1,q);
-	setGyro(2,r);
+    setGyro(0,p);
+    setGyro(1,q);
+    setGyro(2,r);
 
-	// temp
-	setGyroTemp(gyroTemp);
+    // temp
+    setGyroTemp(gyroTemp);
 
-	// accel
-	setAccel(0,aX);
-	setAccel(1,aY);
-	setAccel(2,aZ);
+    // accel
+    setAccel(0,aX);
+    setAccel(1,aY);
+    setAccel(2,aZ);
 
     // differential pressure
-	setPressure(diffPress);
+    setPressure(diffPress);
 }
 
 // see if new data is available
 bool AP_ADC_HIL::new_data_available(const uint8_t *channel_numbers)
 {
-	return true;
+    return true;
 }