--- a/include/quaternion.h	Mon Sep 08 20:14:24 2014 +0200
+++ b/include/quaternion.h	Tue Jul 26 17:41:36 2016 +0200
@@ -26,7 +26,7 @@
  */
 
 #ifndef QUATERNION_H
-#define QUATER_H
+#define QUATERNION_H
 
 /**
  * quaternion class
@@ -64,7 +64,7 @@
 	};
 	Float mag() const
 	{
-		return sqrtf(mag());
+		return sqrtf(mag2());
 	};
 	friend Quaternion operator*(const Quaternion &q1, const Quaternion &q2)
 	{