diff --git a/LEGO1/realtime/orientableroi.cpp b/LEGO1/realtime/orientableroi.cpp
index f8d6d03f..62595da0 100644
--- a/LEGO1/realtime/orientableroi.cpp
+++ b/LEGO1/realtime/orientableroi.cpp
@@ -89,9 +89,9 @@ void OrientableROI::UpdateWorldData(const Matrix4& p_transform)
 }
 
 // FUNCTION: LEGO1 0x100a5a30
-void OrientableROI::FUN_100a5a30(const Vector3& p_vector)
+void OrientableROI::FUN_100a5a30(const Vector3& p_world_velocity)
 {
-	m_world_velocity = p_vector;
+	m_world_velocity = p_world_velocity;
 }
 
 // FUNCTION: LEGO1 0x100a5a50
diff --git a/LEGO1/realtime/orientableroi.h b/LEGO1/realtime/orientableroi.h
index 0c5ca139..90d967f4 100644
--- a/LEGO1/realtime/orientableroi.h
+++ b/LEGO1/realtime/orientableroi.h
@@ -36,7 +36,7 @@ class OrientableROI : public ROI {
 	void FUN_100a46b0(Matrix4& p_transform);
 	void WrappedVTable0x24(const Matrix4& p_transform);
 	void FUN_100a58f0(const Matrix4& p_transform);
-	void FUN_100a5a30(const Vector3& p_vector);
+	void FUN_100a5a30(const Vector3& p_world_velocity);
 
 	const MxMatrix& GetLocal2World() const { return m_local2world; }
 	const float* GetWorldPosition() const { return m_local2world[3]; }