diff --git a/src/vmemsave.c b/src/vmemsave.c
index 0e2aad6..9dc9aaf 100644
--- a/src/vmemsave.c
+++ b/src/vmemsave.c
@@ -518,7 +518,7 @@ extern int UnixPID;
 
 /* Make sure that we kill off any Unix subprocesses before we go away */
 
-void lisp_finish() {
+void lisp_finish(void) {
   char d[4];
 
   DBPRINT(("finish lisp_finish\n"));