--- old/src/java.base/share/classes/java/lang/StringBuilder.java	2016-12-09 08:31:42.793365045 +0100
+++ new/src/java.base/share/classes/java/lang/StringBuilder.java	2016-12-09 08:31:42.700365744 +0100
@@ -234,6 +234,12 @@
         return this;
     }
 
+    @Override
+    public StringBuilder appendN(char c, int n) {
+        super.appendN(c, n);
+        return this;
+    }
+
     /**
      * @since 1.5
      */