diff --git a/test/ref/yacc.c b/test/ref/yacc.c
index f2c3e2a58..776e4f93d 100644
--- a/test/ref/yacc.c
+++ b/test/ref/yacc.c
@@ -409,7 +409,7 @@ yylook()
                         if(testbreak==5)
                         {
                                 fprintf(yyout,"yylook:   error, aborted after 5 loops\n");
-                                exit(0);
+                                exit(EXIT_FAILURE);
                         }
                         testbreak++;