diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.prototype.since.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.prototype.since.js
index ece9eccbbd..173ece34d5 100644
--- a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.prototype.since.js
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.prototype.since.js
@@ -225,7 +225,7 @@ describe("errors", () => {
                 };
                 const pluralSmallestPluralDisallowedOptions = {
                     smallestUnit: pluralSmallestUnit,
-                    largestUnit: disallowedUnit,
+                    largestUnit: pluralDisallowedUnit,
                 };
 
                 expect(() => {
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.prototype.until.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.prototype.until.js
index a83be66f73..222af0f926 100644
--- a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.prototype.until.js
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.prototype.until.js
@@ -226,7 +226,7 @@ describe("errors", () => {
                 };
                 const pluralSmallestPluralDisallowedOptions = {
                     smallestUnit: pluralSmallestUnit,
-                    largestUnit: disallowedUnit,
+                    largestUnit: pluralDisallowedUnit,
                 };
 
                 expect(() => {