diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/toZonedDateTime/basic.js b/test/built-ins/Temporal/PlainDateTime/prototype/toZonedDateTime/basic.js
index 5ced993fc5..78d23ba942 100644
--- a/test/built-ins/Temporal/PlainDateTime/prototype/toZonedDateTime/basic.js
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/toZonedDateTime/basic.js
@@ -12,4 +12,4 @@ const zdt = dt.toZonedDateTime("UTC");
 
 assert.sameValue(zdt.epochNanoseconds, 1577836800000000000n, "nanoseconds");
 assert.sameValue(zdt.calendar.toString(), "iso8601", "calendar");
-assert.sameValue(zdt.timeZone, "UTC", "timezone");
+assert.sameValue(zdt.timeZone.toString(), "UTC", "timezone");