diff --git a/Libraries/LibUnicode/ICU.h b/Libraries/LibUnicode/ICU.h
index 35a562c7faf..9f2126751fb 100644
--- a/Libraries/LibUnicode/ICU.h
+++ b/Libraries/LibUnicode/ICU.h
@@ -118,7 +118,7 @@ Vector<String> icu_string_enumeration_to_list(OwnPtr<icu::StringEnumeration> enu
         if (icu_failure(status) || value == nullptr)
             break;
 
-        if (!filter(value))
+        if (!filter(value, static_cast<size_t>(length)))
             continue;
 
         if (bcp47_keyword) {
@@ -134,7 +134,7 @@ Vector<String> icu_string_enumeration_to_list(OwnPtr<icu::StringEnumeration> enu
 
 ALWAYS_INLINE Vector<String> icu_string_enumeration_to_list(OwnPtr<icu::StringEnumeration> enumeration, char const* bcp47_keyword)
 {
-    return icu_string_enumeration_to_list(move(enumeration), bcp47_keyword, [](char const*) { return true; });
+    return icu_string_enumeration_to_list(move(enumeration), bcp47_keyword, [](char const*, size_t) { return true; });
 }
 
 }
diff --git a/Libraries/LibUnicode/TimeZone.cpp b/Libraries/LibUnicode/TimeZone.cpp
index 3a4409a5481..dcb92c29a32 100644
--- a/Libraries/LibUnicode/TimeZone.cpp
+++ b/Libraries/LibUnicode/TimeZone.cpp
@@ -107,8 +107,8 @@ static Vector<String> icu_available_time_zones(Optional<ByteString> const& regio
     if (icu_failure(status))
         return { "UTC"_string };
 
-    auto time_zones = icu_string_enumeration_to_list(move(time_zone_enumerator), nullptr, [](char const* zone) {
-        return !is_legacy_non_iana_time_zone({ zone, strlen(zone) });
+    auto time_zones = icu_string_enumeration_to_list(move(time_zone_enumerator), nullptr, [](char const* zone, size_t zone_length) {
+        return !is_legacy_non_iana_time_zone({ zone, zone_length });
     });
 
     quick_sort(time_zones);
diff --git a/Libraries/LibUnicode/UnicodeKeywords.cpp b/Libraries/LibUnicode/UnicodeKeywords.cpp
index 519b036fe4e..fec6d4a006d 100644
--- a/Libraries/LibUnicode/UnicodeKeywords.cpp
+++ b/Libraries/LibUnicode/UnicodeKeywords.cpp
@@ -153,7 +153,7 @@ Vector<String> const& available_number_systems()
         if (icu_failure(status))
             return {};
 
-        auto number_systems = icu_string_enumeration_to_list(move(keywords), "nu", [&](char const* keyword) {
+        auto number_systems = icu_string_enumeration_to_list(move(keywords), "nu", [&](char const* keyword, size_t) {
             auto system = adopt_own_if_nonnull(icu::NumberingSystem::createInstanceByName(keyword, status));
             if (icu_failure(status))
                 return false;