diff --git a/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.cpp b/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.cpp
index d839adbca7..3f3b16b45b 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.cpp
@@ -363,8 +363,14 @@ static auto& find_key_in_value(T& value, StringView key)
 {
     if (key == "ca"sv)
         return value.ca;
+    if (key == "co"sv)
+        return value.co;
     if (key == "hc"sv)
         return value.hc;
+    if (key == "kf"sv)
+        return value.kf;
+    if (key == "kn"sv)
+        return value.kn;
     if (key == "nu"sv)
         return value.nu;
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.h b/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.h
index 57ff6c47fa..b45b65b458 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.h
+++ b/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.h
@@ -22,7 +22,10 @@ using Fallback = Variant<Empty, bool, StringView>;
 struct LocaleOptions {
     Value locale_matcher;
     Optional<String> ca; // [[Calendar]]
+    Optional<String> co; // [[Collation]]
     Optional<String> hc; // [[HourCycle]]
+    Optional<String> kf; // [[CaseFirst]]
+    Optional<String> kn; // [[Numeric]]
     Optional<String> nu; // [[NumberingSystem]]
 };
 
@@ -30,7 +33,10 @@ struct LocaleResult {
     String locale;
     String data_locale;
     Optional<String> ca; // [[Calendar]]
+    Optional<String> co; // [[Collation]]
     Optional<String> hc; // [[HourCycle]]
+    Optional<String> kf; // [[CaseFirst]]
+    Optional<String> kn; // [[Numeric]]
     Optional<String> nu; // [[NumberingSystem]]
 };