diff --git a/test/ecmascript.mjs b/test/ecmascript.mjs
index f2f78636..a3ac7adc 100644
--- a/test/ecmascript.mjs
+++ b/test/ecmascript.mjs
@@ -470,7 +470,9 @@ describe('ECMAScript', () => {
       const missingFromCLDR = ['CET', 'EET', 'MET', 'WET'];
 
       // All IDs that we know about
-      const ids = [...new Set([...missingFromCLDR, ...cldrIdentifiers, ...Intl.supportedValuesOf('timeZone')])];
+      // Intl.supportedValuesOf is not available in older runtimes (Node 14)
+      const IntlNativeIdentifiers = Intl.supportedValuesOf ? Intl.supportedValuesOf('timeZone') : [];
+      const ids = [...new Set([...missingFromCLDR, ...cldrIdentifiers, ...IntlNativeIdentifiers])];
 
       for (const id of ids) {
         const lower = id.toLowerCase();
@@ -481,6 +483,9 @@ describe('ECMAScript', () => {
       }
     });
     it('Returns canonical IDs', () => {
+      if (!Intl.supportedValuesOf) {
+        return; // Some environments don't support Intl.supportedValuesOf.
+      }
       const ids = Intl.supportedValuesOf('timeZone');
       for (const id of ids) {
         equal(ES.GetAvailableNamedTimeZoneIdentifier(id).primaryIdentifier, id);
diff --git a/test/expected-failures.txt b/test/expected-failures.txt
index 28fdab2c..1e8e1383 100644
--- a/test/expected-failures.txt
+++ b/test/expected-failures.txt
@@ -2,3 +2,6 @@
 # expected test failures for the transpiled or optimized builds of the polyfill,
 # see expected-failures-es5.txt and expected-failures-opt.txt respectively.
 
+# Upstream commit 076f2871 introduces a second ToString call on a calendar when
+# canonicalizing the timezone name.
+staging/Intl402/Temporal/old/date-time-format.js