diff --git a/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.cpp b/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.cpp
index a65968eb1e..61743443dc 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.cpp
@@ -690,7 +690,7 @@ Optional<int> default_number_option(GlobalObject& global_object, Value value, in
 }
 
 // 9.2.15 GetNumberOption ( options, property, minimum, maximum, fallback ), https://tc39.es/ecma402/#sec-getnumberoption
-Optional<int> get_number_option(GlobalObject& global_object, Object& options, PropertyName const& property, int minimum, int maximum, Optional<int> fallback)
+Optional<int> get_number_option(GlobalObject& global_object, Object const& options, PropertyName const& property, int minimum, int maximum, Optional<int> fallback)
 {
     auto& vm = global_object.vm();
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.h b/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.h
index 51900d939e..c2484bcc30 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.h
+++ b/Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.h
@@ -48,7 +48,7 @@ Array* supported_locales(GlobalObject&, Vector<String> const& requested_locales,
 Object* coerce_options_to_object(GlobalObject& global_object, Value options);
 Value get_option(GlobalObject& global_object, Object const& options, PropertyName const& property, Value::Type type, Vector<StringView> const& values, Fallback fallback);
 Optional<int> default_number_option(GlobalObject& global_object, Value value, int minimum, int maximum, Optional<int> fallback);
-Optional<int> get_number_option(GlobalObject& global_object, Object& options, PropertyName const& property, int minimum, int maximum, Optional<int> fallback);
+Optional<int> get_number_option(GlobalObject& global_object, Object const& options, PropertyName const& property, int minimum, int maximum, Optional<int> fallback);
 Vector<PatternPartition> partition_pattern(StringView pattern);
 
 }