diff --git a/libs/libc/include/wchar.h b/libs/libc/include/wchar.h
index fb2033da..a206751e 100644
--- a/libs/libc/include/wchar.h
+++ b/libs/libc/include/wchar.h
@@ -1,11 +1,24 @@
 #ifndef _WCHAR_H
 #define _WCHAR_H
 
+#include <bits/macros.h>
 #include <stddef.h>
 
-#ifndef __WINT_TYPE__
-#define __WINT_TYPE__ unsigned int
+typedef unsigned int wint_t;
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /* Return the length of a wide-character string. */
+    size_t wcslen(const wchar_t* str);
+
+    /* Concatenates the wide-character string src into dest. */
+    __lc_is_deprecated wchar_t* wcscat(wchar_t* dest, const wchar_t* src);
+
+#ifdef __cplusplus
+}
 #endif
-typedef __WINT_TYPE__ wint_t;
 
 #endif
\ No newline at end of file
diff --git a/libs/libc/src/wchar.cpp b/libs/libc/src/wchar.cpp
new file mode 100644
index 00000000..50d32df9
--- /dev/null
+++ b/libs/libc/src/wchar.cpp
@@ -0,0 +1,24 @@
+#include <wchar.h>
+
+extern "C"
+{
+    size_t wcslen(const wchar_t* str)
+    {
+        const wchar_t* i = str;
+        for (; *i; ++i)
+            ;
+        return (i - str);
+    }
+
+    wchar_t* wcscat(wchar_t* dest, const wchar_t* src)
+    {
+        size_t dest_len = wcslen(dest);
+        size_t i;
+
+        for (i = 0; *(src + i); i++) *(dest + dest_len + i) = *(src + i);
+
+        *(dest + dest_len + i) = L'\0';
+
+        return dest;
+    }
+}
\ No newline at end of file
diff --git a/tests/libc/Makefile b/tests/libc/Makefile
index db92eeec..698044bc 100644
--- a/tests/libc/Makefile
+++ b/tests/libc/Makefile
@@ -4,7 +4,7 @@ DESTDIR := $(LUNA_ROOT)/initrd/bin
 build:
 	@mkdir -p $(TESTDIR)/bin
 	$(LUNA_ROOT)/tools/sync-libc.sh
-	$(CC) $(TESTDIR)/string.c $(TESTDIR)/stdlib.c $(TESTDIR)/Test.c -I$(LUNA_ROOT)/tests -o $(TESTDIR)/bin/test-libc -Wall -Wextra -Wno-deprecated-declarations -Wno-stringop-overread -Werror
+	$(CC) $(TESTDIR)/string.c $(TESTDIR)/stdlib.c $(TESTDIR)/wchar.c $(TESTDIR)/Test.c -I$(LUNA_ROOT)/tests -o $(TESTDIR)/bin/test-libc -Wall -Wextra -Wno-deprecated-declarations -Wno-stringop-overread -Werror
 
 install:
 	$(LUNA_ROOT)/tools/clean.sh
diff --git a/tests/libc/Test.c b/tests/libc/Test.c
index cba4b5bc..afc9b17d 100644
--- a/tests/libc/Test.c
+++ b/tests/libc/Test.c
@@ -30,6 +30,9 @@ DEFINE_TEST(mktemp);
 DEFINE_TEST(qsort);
 DEFINE_TEST(bsearch);
 
+// wchar.h
+DEFINE_TEST(wcslen);
+
 int main()
 {
     START_TEST_CASE(string.h);
@@ -61,4 +64,7 @@ int main()
     RUN_TEST(mktemp);
     RUN_TEST(qsort);
     RUN_TEST(bsearch);
+
+    START_TEST_CASE(wchar.h);
+    RUN_TEST(wcslen);
 }
\ No newline at end of file
diff --git a/tests/libc/wchar.c b/tests/libc/wchar.c
new file mode 100644
index 00000000..bec6dc7e
--- /dev/null
+++ b/tests/libc/wchar.c
@@ -0,0 +1,21 @@
+#include "Test.h"
+#include <wchar.h>
+
+DEFINE_TEST(wcslen)
+{
+    START_TEST(wcslen);
+
+    const wchar_t* str = L"Hello, World!";
+
+    size_t len = wcslen(str);
+
+    EXPECT_EQ(len, 13);
+
+    wchar_t null[] = {L'\0'};
+
+    len = wcslen(null);
+
+    EXPECT_EQ(len, 0);
+
+    TEST_SUCCESS();
+}
\ No newline at end of file