diff --git a/Libraries/LibJS/Runtime/Temporal/PlainMonthDayPrototype.cpp b/Libraries/LibJS/Runtime/Temporal/PlainMonthDayPrototype.cpp
index 97d4b327e1e..9dec440999d 100644
--- a/Libraries/LibJS/Runtime/Temporal/PlainMonthDayPrototype.cpp
+++ b/Libraries/LibJS/Runtime/Temporal/PlainMonthDayPrototype.cpp
@@ -5,6 +5,8 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibJS/Runtime/Intl/DateTimeFormat.h>
+#include <LibJS/Runtime/Intl/DateTimeFormatConstructor.h>
 #include <LibJS/Runtime/Temporal/Calendar.h>
 #include <LibJS/Runtime/Temporal/PlainDate.h>
 #include <LibJS/Runtime/Temporal/PlainMonthDay.h>
@@ -152,15 +154,23 @@ JS_DEFINE_NATIVE_FUNCTION(PlainMonthDayPrototype::to_string)
 }
 
 // 10.3.9 Temporal.PlainMonthDay.prototype.toLocaleString ( [ locales [ , options ] ] ), https://tc39.es/proposal-temporal/#sec-temporal.plainmonthday.prototype.tolocalestring
-// NOTE: This is the minimum toLocaleString implementation for engines without ECMA-402.
+// 15.12.5.1 Temporal.PlainMonthDay.prototype.toLocaleString ( [ locales [ , options ] ] ), https://tc39.es/proposal-temporal/#sup-temporal.plainmonthday.prototype.tolocalestring
 JS_DEFINE_NATIVE_FUNCTION(PlainMonthDayPrototype::to_locale_string)
 {
+    auto& realm = *vm.current_realm();
+
+    auto locales = vm.argument(0);
+    auto options = vm.argument(1);
+
     // 1. Let monthDay be the this value.
     // 2. Perform ? RequireInternalSlot(monthDay, [[InitializedTemporalMonthDay]]).
     auto month_day = TRY(typed_this_object(vm));
 
-    // 3. Return TemporalMonthDayToString(monthDay, auto).
-    return PrimitiveString::create(vm, temporal_month_day_to_string(month_day, ShowCalendar::Auto));
+    // 3. Let dateFormat be ? CreateDateTimeFormat(%Intl.DateTimeFormat%, locales, options, DATE, DATE).
+    auto date_format = TRY(Intl::create_date_time_format(vm, realm.intrinsics().intl_date_time_format_constructor(), locales, options, Intl::OptionRequired::Date, Intl::OptionDefaults::Date));
+
+    // 4. Return ? FormatDateTime(dateFormat, monthDay).
+    return PrimitiveString::create(vm, TRY(Intl::format_date_time(vm, date_format, month_day)));
 }
 
 // 10.3.10 Temporal.PlainMonthDay.prototype.toJSON ( ), https://tc39.es/proposal-temporal/#sec-temporal.plainmonthday.prototype.tolocalestring
diff --git a/Libraries/LibJS/Tests/builtins/Temporal/PlainMonthDay/PlainMonthDay.prototype.toLocaleString.js b/Libraries/LibJS/Tests/builtins/Temporal/PlainMonthDay/PlainMonthDay.prototype.toLocaleString.js
index f5ea5e9cc2f..54c17948d59 100644
--- a/Libraries/LibJS/Tests/builtins/Temporal/PlainMonthDay/PlainMonthDay.prototype.toLocaleString.js
+++ b/Libraries/LibJS/Tests/builtins/Temporal/PlainMonthDay/PlainMonthDay.prototype.toLocaleString.js
@@ -6,11 +6,8 @@ describe("correct behavior", () => {
     test("basic functionality", () => {
         let plainMonthDay;
 
-        plainMonthDay = new Temporal.PlainMonthDay(7, 6);
-        expect(plainMonthDay.toLocaleString()).toBe("07-06");
-
-        plainMonthDay = new Temporal.PlainMonthDay(7, 6, "gregory", 2021);
-        expect(plainMonthDay.toLocaleString()).toBe("2021-07-06[u-ca=gregory]");
+        plainMonthDay = new Temporal.PlainMonthDay(7, 6, "gregory");
+        expect(plainMonthDay.toLocaleString()).toBe("7/6");
     });
 });