--- ode_c.c.orig	2009-08-13 04:02:43.000000000 +0200
+++ ode_c.c	2009-08-13 04:04:17.000000000 +0200
@@ -4308,7 +4308,7 @@
 ocamlode_dPlaneSpace (value nv)
 {
 #if defined(MEM_CPY) // dSINGLE
-  CAMLparam1 (n);
+  CAMLparam1 (nv);
   CAMLlocal1 (rv);
   dVector3 n, p, q;
   dVector3_val (nv, n);