diff --git a/math/quat.cpp b/math/quat.cpp
index 9225059c4a1..6ded209aea0 100644
--- a/math/quat.cpp
+++ b/math/quat.cpp
@@ -238,6 +238,15 @@ void Quaternion::getEuler(Angle *first, Angle *second, Angle *third, EulerOrder
 		*third = t;
 }
 
+Quaternion& Quaternion::operator=(const Quaternion& quat) {
+	x() = quat.x();
+	y() = quat.y();
+	z() = quat.z();
+	w() = quat.w();
+
+	return *this;
+}
+
 Quaternion Quaternion::operator*(const Quaternion &o) const {
 	return Quaternion(
 		w() * o.x() + x() * o.w() + y() * o.z() - z() * o.y(),
diff --git a/math/quat.h b/math/quat.h
index 4b490bdfec6..b7f287e0b18 100644
--- a/math/quat.h
+++ b/math/quat.h
@@ -197,11 +197,11 @@ public:
 	Angle getAngleBetween(const Quaternion &to);
 
 	/**
-	 * Assignment operator for assigning a vector of values (X,Y,Z,W) to a Quaternion
-	 * @param vec           The source vector
+	 * Assignment operator
+	 * @param vec           The source quaternion
 	 * @return              A reference to this Quaternion
 	 */
-	Quaternion& operator=(Vector4d &vec);
+	Quaternion& operator=(const Quaternion& quat);
 
 	/**
 	 * Multiply two Quaternions