diff --git a/Userland/Libraries/LibC/CMakeLists.txt b/Userland/Libraries/LibC/CMakeLists.txt
index 48a627d85e..98b31ba227 100644
--- a/Userland/Libraries/LibC/CMakeLists.txt
+++ b/Userland/Libraries/LibC/CMakeLists.txt
@@ -12,6 +12,7 @@ set(LIBC_SOURCES
     grp.cpp
     inttypes.cpp
     ioctl.cpp
+    langinfo.cpp
     libcinit.cpp
     libgen.cpp
     link.cpp
diff --git a/Userland/Libraries/LibC/langinfo.cpp b/Userland/Libraries/LibC/langinfo.cpp
new file mode 100644
index 0000000000..9d5d9d2eee
--- /dev/null
+++ b/Userland/Libraries/LibC/langinfo.cpp
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <langinfo.h>
+
+static const char* __nl_langinfo(nl_item item)
+{
+    switch (item) {
+    case CODESET:
+        return "UTF-8";
+    default:
+        return "";
+    }
+}
+
+extern "C" {
+
+char* nl_langinfo(nl_item item)
+{
+    // POSIX states that returned strings should not be modified,
+    // so this cast is probably fine.
+    return const_cast<char*>(__nl_langinfo(item));
+}
+}
diff --git a/Userland/Libraries/LibC/langinfo.h b/Userland/Libraries/LibC/langinfo.h
new file mode 100644
index 0000000000..3470f18f93
--- /dev/null
+++ b/Userland/Libraries/LibC/langinfo.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <nl_types.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+enum {
+    CODESET,
+};
+
+char* nl_langinfo(nl_item);
+
+__END_DECLS
diff --git a/Userland/Libraries/LibC/nl_types.h b/Userland/Libraries/LibC/nl_types.h
new file mode 100644
index 0000000000..31fcbc0e75
--- /dev/null
+++ b/Userland/Libraries/LibC/nl_types.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+typedef int nl_item;
+
+__END_DECLS