diff --git a/libraries/AP_Airspeed/AP_Airspeed.cpp b/libraries/AP_Airspeed/AP_Airspeed.cpp
index 33e40f0c59..91a7f3c783 100644
--- a/libraries/AP_Airspeed/AP_Airspeed.cpp
+++ b/libraries/AP_Airspeed/AP_Airspeed.cpp
@@ -1,12 +1,12 @@
 /// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
 /*
-    APM_Airspeed.cpp - airspeed (pitot) driver
-
-    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.
-*/
+ *   APM_Airspeed.cpp - airspeed (pitot) driver
+ *
+ *   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.
+ */
 
 #include <FastSerial.h>
 #include <AP_Common.h>
@@ -47,29 +47,29 @@ const AP_Param::GroupInfo AP_Airspeed::var_info[] PROGMEM = {
 // the get_airspeed() interface can be used
 void AP_Airspeed::calibrate(void (*callback)(unsigned long t))
 {
-	float sum = 0;
-	uint8_t c;
-	if (!_enable) {
-		return;
-	}
-	_source->read();
-	for (c = 0; c < 10; c++) {
-		callback(100);
-		sum += _source->read();
-	}
-	_airspeed_raw = sum/c;
-	_offset.set_and_save(_airspeed_raw);
-	_airspeed = 0;
+    float sum = 0;
+    uint8_t c;
+    if (!_enable) {
+        return;
+    }
+    _source->read();
+    for (c = 0; c < 10; c++) {
+        callback(100);
+        sum += _source->read();
+    }
+    _airspeed_raw = sum/c;
+    _offset.set_and_save(_airspeed_raw);
+    _airspeed = 0;
 }
 
 // read the airspeed sensor
 void AP_Airspeed::read(void)
 {
-	float airspeed_pressure;
-	if (!_enable) {
-		return;
-	}
-	_airspeed_raw 		= _source->read();
-	airspeed_pressure 	= max((_airspeed_raw - _offset), 0);
-	_airspeed		= sqrt(airspeed_pressure * _ratio);	
+    float airspeed_pressure;
+    if (!_enable) {
+        return;
+    }
+    _airspeed_raw           = _source->read();
+    airspeed_pressure       = max((_airspeed_raw - _offset), 0);
+    _airspeed               = sqrt(airspeed_pressure * _ratio);
 }