diff --git a/3d-models.cpp b/3d-models.cpp
index 87a74758..7d64f259 100644
--- a/3d-models.cpp
+++ b/3d-models.cpp
@@ -17,7 +17,7 @@ ld eyepos;
 #define S (cgi.scalefactor / 0.805578)
 #define SH (cgi.scalefactor / 0.805578 * vid.height_width / 1.5)
 
-#define revZ ((WDIM == 2 || hybri) ? -1 : 1)
+#define revZ ((WDIM == 2 || prod) ? -1 : 1)
 
 hyperpoint shcenter;