diff --git a/SwingTwist.cpp b/SwingTwist.cpp
index 88390a2..a82097c 100644
--- a/SwingTwist.cpp
+++ b/SwingTwist.cpp
@@ -89,7 +89,8 @@ SwingTwistOf<T> SwingTwistOf<T>::operator*=(const SwingTwistOf<T>& rotation) {
 template <typename T>
 SwingTwistOf<T> Passer::LinearAlgebra::SwingTwistOf<T>::Inverse(
     SwingTwistOf<T> rotation) {
-  SwingTwistOf<T> r = SwingTwistOf<T>(-rotation.swing, -rotation.twist);
+  SwingTwistOf<T> r = SwingTwistOf<T>(
+      -rotation.swing.horizontal, -rotation.swing.vertical, -rotation.twist);
   return r;
 }