diff --git a/src/DETHRACE/common/piping.c b/src/DETHRACE/common/piping.c
index 3a308780..eb9ec40b 100644
--- a/src/DETHRACE/common/piping.c
+++ b/src/DETHRACE/common/piping.c
@@ -1791,7 +1791,7 @@ void UndoModelGeometry(tPipe_chunk** pChunk) {
     br_model* model_ptr;
     tCar_spec* car;
 
-    if (((*pChunk)->subject_index & 0xff00) == 0) {
+    if (((*pChunk)->subject_index >> 8) == 0) {
         car = &gProgram_state.current_car;
     } else {
         car = GetCarSpec((*pChunk)->subject_index >> 8, (*pChunk)->subject_index & 0x00ff);