diff --git a/libraries/AP_Common/AP_Vector.h b/libraries/AP_Common/AP_Vector.h
index 0d60ae42a8..dd456352f2 100644
--- a/libraries/AP_Common/AP_Vector.h
+++ b/libraries/AP_Common/AP_Vector.h
@@ -23,9 +23,9 @@
 #include <stdlib.h>
 #include <inttypes.h>
 #if defined(ARDUINO) && ARDUINO >= 100
-	#include "Arduino.h"
+ #include "Arduino.h"
 #else
-	#include <WProgram.h>
+ #include <WProgram.h>
 #endif
 
 #ifdef ASSERT