--- a/Bindings/OCaml/brlapi_stubs.c	

+++ a/Bindings/OCaml/brlapi_stubs.c	

@@ -144,6 +144,7 @@ CAMLprim value brlapiml_errorCode_of_error(value camlError)

 /* Raises the Brlapi_error exception */

 static void raise_brlapi_error(void)

 {

+  CAMLparam0();

   static value *exception = NULL;

   CAMLlocal1(res);

   if (exception==NULL) exception = caml_named_value("Brlapi_error");

@@ -157,6 +158,7 @@ static void raise_brlapi_error(void)

 /* Raises Brlapi_exception */

 static void BRLAPI_STDCALL raise_brlapi_exception(int err, brlapi_packetType_t type, const void *packet, size_t size)

 {

+  CAMLparam0();

   static value *exception = NULL;

   int i;

   CAMLlocal2(str, res);