diff --git a/tools/debugger/gdbsx/xg/xg_main.c b/tools/debugger/gdbsx/xg/xg_main.c
index 4576c762af..580fe237b2 100644
--- a/tools/debugger/gdbsx/xg/xg_main.c
+++ b/tools/debugger/gdbsx/xg/xg_main.c
@@ -121,7 +121,7 @@ xgprt(const char *fn, const char *fmt, ...)
  *         -1 failure, errno set.
  */
 int 
-xg_init()
+xg_init(void)
 {
     int flags, saved_errno;