diff --git a/libc/Makefile b/libc/Makefile
index ded8c575..22457aa2 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -260,6 +260,7 @@ wchar/wcsncasecmp.o \
 wchar/wcsncat.o \
 wchar/wcsncmp.o \
 wchar/wcsncpy.o \
+wchar/wcsnlen.o \
 wchar/wcsnrtombs.o \
 wchar/wcspbrk.o \
 wchar/wcsrchr.o \
diff --git a/libc/include/wchar.h b/libc/include/wchar.h
index f5bc6a84..0a039219 100644
--- a/libc/include/wchar.h
+++ b/libc/include/wchar.h
@@ -205,7 +205,7 @@ int wcscasecmp(const wchar_t*, const wchar_t*);
 wchar_t* wcsdup(const wchar_t*);
 int wcsncasecmp(const wchar_t*, const wchar_t *, size_t);
 /* TODO: int wcsncasecmp_l(const wchar_t*, const wchar_t *, size_t, locale_t); */
-/* TODO: size_t wcsnlen(const wchar_t*, size_t); */
+size_t wcsnlen(const wchar_t*, size_t);
 size_t wcsnrtombs(char* __restrict, const wchar_t** __restrict, size_t, size_t, mbstate_t* __restrict);
 /* TODO: size_t wcsxfrm_l(wchar_t* __restrict, const wchar_t* __restrict, size_t, locale_t); */
 #endif
diff --git a/libc/wchar/wcsnlen.cpp b/libc/wchar/wcsnlen.cpp
new file mode 100644
index 00000000..5841e623
--- /dev/null
+++ b/libc/wchar/wcsnlen.cpp
@@ -0,0 +1,33 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2014.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    wchar/wcsnlen.cpp
+    Returns the length of a fixed length string.
+
+*******************************************************************************/
+
+#include <wchar.h>
+
+extern "C" size_t wcsnlen(const wchar_t* str, size_t maxlen)
+{
+	size_t ret = 0;
+	while ( ret < maxlen && str[ret] )
+		ret++;
+	return ret;
+}