diff --git a/AK/StringUtils.cpp b/AK/StringUtils.cpp
index b9aed9c9aa..42887cce05 100644
--- a/AK/StringUtils.cpp
+++ b/AK/StringUtils.cpp
@@ -465,9 +465,9 @@ String to_titlecase(StringView str)
 
     for (auto ch : str) {
         if (next_is_upper)
-            builder.append_code_point(to_ascii_uppercase(ch));
+            builder.append(to_ascii_uppercase(ch));
         else
-            builder.append_code_point(to_ascii_lowercase(ch));
+            builder.append(to_ascii_lowercase(ch));
         next_is_upper = ch == ' ';
     }
 
diff --git a/Tests/AK/TestStringUtils.cpp b/Tests/AK/TestStringUtils.cpp
index a06227c137..98011b59bf 100644
--- a/Tests/AK/TestStringUtils.cpp
+++ b/Tests/AK/TestStringUtils.cpp
@@ -387,4 +387,6 @@ TEST_CASE(to_titlecase)
     EXPECT_EQ(AK::StringUtils::to_titlecase("foo  bar"sv), "Foo  Bar"sv);
     EXPECT_EQ(AK::StringUtils::to_titlecase("foo   bar"sv), "Foo   Bar"sv);
     EXPECT_EQ(AK::StringUtils::to_titlecase("   foo   bar   "sv), "   Foo   Bar   "sv);
+    EXPECT_EQ(AK::StringUtils::to_titlecase("\xc3\xa7"sv), "\xc3\xa7"sv);         // U+00E7 LATIN SMALL LETTER C WITH CEDILLA
+    EXPECT_EQ(AK::StringUtils::to_titlecase("\xe1\x80\x80"sv), "\xe1\x80\x80"sv); // U+1000 MYANMAR LETTER KA
 }