diff --git a/tests/main.c b/tests/main.c
index 45f6c5ce..c80b0426 100644
--- a/tests/main.c
+++ b/tests/main.c
@@ -1974,7 +1974,7 @@ bye () {
   stty(0,&sgttyOrg);
 #endif
 #endif
-  exit();
+  exit(0);
 }
 
 #ifdef UNIX