diff --git a/test/built-ins/Temporal/Duration/compare/relativeto-hour.js b/test/built-ins/Temporal/Duration/compare/relativeto-hour.js
index 149885e1db..876d865cdf 100644
--- a/test/built-ins/Temporal/Duration/compare/relativeto-hour.js
+++ b/test/built-ins/Temporal/Duration/compare/relativeto-hour.js
@@ -4,6 +4,7 @@
 /*---
 esid: sec-temporal.duration.compare
 description: relativeTo with hours.
+includes: [temporalHelpers.js]
 features: [Temporal]
 ---*/
 
@@ -22,3 +23,19 @@ assert.sameValue(Temporal.Duration.compare(oneDay, hours24, { relativeTo: "2019-
 assert.sameValue(Temporal.Duration.compare(oneDay, hours24, { relativeTo: { year: 2019, month: 11, day: 3 } }),
   0,
   "casts relativeTo to PlainDate from object");
+
+const timeZone = TemporalHelpers.springForwardFallBackTimeZone();
+assert.sameValue(
+  Temporal.Duration.compare(oneDay, hours24, { relativeTo: new Temporal.ZonedDateTime(0n, timeZone) }),
+  0,
+  'relativeTo does not affect days if ZonedDateTime, and duration encompasses no DST change');
+assert.sameValue(
+  Temporal.Duration.compare(oneDay, hours24, { relativeTo: new Temporal.ZonedDateTime(972802800_000_000_000n, timeZone) }),
+  1,
+  'relativeTo does affect days if ZonedDateTime, and duration encompasses DST change');
+assert.sameValue(
+  Temporal.Duration.compare(oneDay, hours24, {
+    relativeTo: { year: 2000, month: 10, day: 29, timeZone }
+  }),
+  1,
+  'casts relativeTo to ZonedDateTime from object');