diff --git a/test/built-ins/Temporal/Calendar/prototype/mergeFields/non-string-properties.js b/test/built-ins/Temporal/Calendar/prototype/mergeFields/non-string-properties.js
index 2908be90ba..2a48dbf62c 100644
--- a/test/built-ins/Temporal/Calendar/prototype/mergeFields/non-string-properties.js
+++ b/test/built-ins/Temporal/Calendar/prototype/mergeFields/non-string-properties.js
@@ -13,22 +13,43 @@ info: |
   5. Set additionalFields to ? ToObject(additionalFields).
   6. Return ? DefaultMergeFields(fields, additionalFields).
 features: [Temporal]
-includes: [deepEqual.js]
 ---*/
 
+function assertEntriesEqual(actual, expectedEntries, message) {
+  const names = Object.getOwnPropertyNames(actual);
+  const symbols = Object.getOwnPropertySymbols(actual);
+  const actualKeys = names.concat(symbols);
+  assert.sameValue(
+    actualKeys.length,
+    expectedEntries.length,
+    `${message}: expected object to have ${expectedEntries.length} properties, not ${actualKeys.length}:`
+  );
+  for (var index = 0; index < actualKeys.length; index++) {
+    const actualKey = actualKeys[index];
+    const expectedKey = expectedEntries[index][0];
+    const expectedValue = expectedEntries[index][1];
+    assert.sameValue(actualKey, expectedKey, `${message}: key ${index}:`);
+    assert.sameValue(actual[actualKey], expectedValue, `${message}: value ${index}:`);
+  }
+}
+
 const cal = new Temporal.Calendar("iso8601");
 
-assert.deepEqual(
+assertEntriesEqual(
   cal.mergeFields({ 1: 2 }, { 3: 4 }),
-  { "1": 2, "3": 4 },
+  [["1", 2], ["3", 4]],
   "number keys are actually string keys and are merged as such"
 );
-assert.deepEqual(
+assertEntriesEqual(
   cal.mergeFields({ 1n: 2 }, { 2n: 4 }),
-  { "1": 2, "2": 4 },
+  [["1", 2], ["2", 4]],
   "bigint keys are actually string keys and are merged as such"
 );
 
 const foo = Symbol("foo");
 const bar = Symbol("bar");
-assert.deepEqual(cal.mergeFields({ [foo]: 1 }, { [bar]: 2 }), {}, "symbol keys are not merged");
+assertEntriesEqual(
+  cal.mergeFields({ [foo]: 1 }, { [bar]: 2 }),
+  [],
+  "symbol keys are not merged"
+);