diff --git a/test/intl402/Collator/missing-unicode-ext-value-defaults-to-true.js b/test/intl402/Collator/missing-unicode-ext-value-defaults-to-true.js
index 44642492b4..e98fe68786 100644
--- a/test/intl402/Collator/missing-unicode-ext-value-defaults-to-true.js
+++ b/test/intl402/Collator/missing-unicode-ext-value-defaults-to-true.js
@@ -10,7 +10,7 @@ description: >
 author: Norbert Lindenberg
 ---*/
 
-var extensions = ["-u-co-phonebk-kn", "-u-kn-co-phonebk"];
+var extensions = ["-u-co-phonebk-kn", "-u-kn-co-phonebk", "-u-co-phonebk-kn-true", "-u-kn-true-co-phonebk"];
 extensions.forEach(function (extension) {
     var defaultLocale = new Intl.Collator().resolvedOptions().locale;
     var collator = new Intl.Collator([defaultLocale + extension], {usage: "sort"});
@@ -18,6 +18,8 @@ extensions.forEach(function (extension) {
     var numeric = collator.resolvedOptions().numeric;
     if (numeric !== undefined) {
         assert.sameValue(numeric, true, "Default value for \"kn\" should be true, but is " + numeric + ".");
-        assert.sameValue(locale.indexOf("-kn"), -1, "\"kn\" is returned in locale, but shouldn't be.");
+        assert.sameValue(locale.indexOf("-kn-false"), -1, "\"kn-false\" is returned in locale, but shouldn't be.");
+        assert.sameValue(locale.indexOf("-kn-true"), -1, "\"kn-true\" is returned in locale, but shouldn't be.");
+        assert.sameValue(locale.indexOf("-kn") >= 0, true, "\"kn\" should be returned in locale.");
     }
 });