--- a/jdk/src/java.base/share/classes/java/util/Locale.java	Thu Jun 01 12:43:11 2017 -0700
+++ b/jdk/src/java.base/share/classes/java/util/Locale.java	Thu Jun 01 12:43:46 2017 -0700
@@ -2702,6 +2702,7 @@
          * @see #setExtension(char, String)
          */
         public Builder removeUnicodeLocaleAttribute(String attribute) {
+            Objects.requireNonNull(attribute);
             try {
                 localeBuilder.removeUnicodeLocaleAttribute(attribute);
             } catch (LocaleSyntaxException e) {