diff --git a/Runtime/World/CMorphBall.cpp b/Runtime/World/CMorphBall.cpp
index 10fdbfee1..d2f010a0d 100644
--- a/Runtime/World/CMorphBall.cpp
+++ b/Runtime/World/CMorphBall.cpp
@@ -2176,7 +2176,7 @@ void CMorphBall::ApplyGravity(CStateManager& mgr) {
   }
 }
 
-void CMorphBall::SpinToSpeed(float holdMag, zeus::CVector3f torque, float mag) {
+void CMorphBall::SpinToSpeed(float holdMag, const zeus::CVector3f& torque, float mag) {
   x0_player.ApplyTorqueWR(torque * ((holdMag - x0_player.GetAngularVelocityWR().getVector().magnitude()) * mag));
 }
 
diff --git a/Runtime/World/CMorphBall.hpp b/Runtime/World/CMorphBall.hpp
index c7dfb633b..fe6153089 100644
--- a/Runtime/World/CMorphBall.hpp
+++ b/Runtime/World/CMorphBall.hpp
@@ -250,7 +250,7 @@ public:
                          const CStateManager& mgr);
   float CalculateSurfaceFriction() const;
   void ApplyGravity(CStateManager& mgr);
-  void SpinToSpeed(float holdMag, zeus::CVector3f torque, float mag);
+  void SpinToSpeed(float holdMag, const zeus::CVector3f& torque, float mag);
   float ComputeMaxSpeed() const;
   void Touch(CActor& actor, CStateManager& mgr);
   bool IsClimbable(const CCollisionInfo& cinfo) const;