diff --git a/LEGO1/lego/sources/roi/legoroi.cpp b/LEGO1/lego/sources/roi/legoroi.cpp
index cc970665..33475adc 100644
--- a/LEGO1/lego/sources/roi/legoroi.cpp
+++ b/LEGO1/lego/sources/roi/legoroi.cpp
@@ -488,7 +488,13 @@ void TimeROI::FUN_100a9b40(Matrix4& p_matrix, LegoTime p_time)
 		Mx3DPointFloat targetPosition(p_matrix[3]);
 
 		// TODO: Figure out how to get type right for the call
+		// TODO: Fix constness of vector/matrix functions
+#ifdef COMPAT_MODE
+		Vector3 worldPosition(m_local2world[3]);
+		((Vector3&) targetPosition).Sub(&worldPosition);
+#else
 		((Vector3&) targetPosition).Sub(&Vector3(m_local2world[3]));
+#endif
 
 		float division = time * 0.001;
 		((Vector3&) targetPosition).Div(division);