diff --git a/src/modules/Gmp/mpz_glue.c b/src/modules/Gmp/mpz_glue.c
index 5e4bbed6f65f7f83baab500dbd5a39538f24b1b0..e28c580b31235c9d05acb78042012c0ec143fc1f 100644
--- a/src/modules/Gmp/mpz_glue.c
+++ b/src/modules/Gmp/mpz_glue.c
@@ -4,7 +4,7 @@
 ||| See the files COPYING and DISCLAIMER for more information.
 \*/
 #include "global.h"
-RCSID("$Id: mpz_glue.c,v 1.16 1997/04/28 23:49:11 hubbe Exp $");
+RCSID("$Id: mpz_glue.c,v 1.17 1997/05/15 17:36:01 grubba Exp $");
 #include "gmp_machine.h"
 #include "types.h"
 
@@ -296,7 +296,7 @@ static void mpzmod_cast(INT32 args)
 /* Converts an svalue, located on the stack, to an mpz object */
 static MP_INT *get_mpz(struct svalue *s, int throw_error)
 {
-#define ERROR(x) (throw_error ? error(x) : 0)
+#define ERROR(x) if (throw_error) error(x)
   struct object *o;
   switch(s->type)
   {