--- old/src/java.base/share/classes/java/util/Formatter.java	2018-06-07 19:22:34.030687606 -0700
+++ new/src/java.base/share/classes/java/util/Formatter.java	2018-06-07 19:22:33.524641741 -0700
@@ -2914,7 +2914,7 @@
                 a.append(System.lineSeparator());
                 break;
             case Conversion.PERCENT_SIGN:
-                a.append('%');
+                print("%", l);
                 break;
             default:
                 assert false;