diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/argument-propertybag-calendar-number.js b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/argument-propertybag-calendar-number.js
index 4320436738..b5c7061ced 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/argument-propertybag-calendar-number.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/argument-propertybag-calendar-number.js
@@ -7,7 +7,8 @@ description: A number as calendar in a property bag is converted to a string, th
 features: [Temporal]
 ---*/
 
-const instance = new Temporal.ZonedDateTime(1_000_000_000_000_000_000n, "UTC");
+const timeZone = new Temporal.TimeZone("UTC");
+const instance = new Temporal.ZonedDateTime(1_000_000_000_000_000_000n, timeZone);
 
 const calendar = 19970327;
 
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/argument-propertybag-calendar-wrong-type.js b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/argument-propertybag-calendar-wrong-type.js
index bd12652c8d..54ed639ee7 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/argument-propertybag-calendar-wrong-type.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/argument-propertybag-calendar-wrong-type.js
@@ -10,7 +10,7 @@ features: [BigInt, Symbol, Temporal]
 ---*/
 
 const timeZone = new Temporal.TimeZone("UTC");
-const instance = new Temporal.ZonedDateTime(1_000_000_000_000_000_000n, "UTC");
+const instance = new Temporal.ZonedDateTime(1_000_000_000_000_000_000n, timeZone);
 
 const rangeErrorTests = [
   [null, "null"],