diff --git a/headers/posix/wchar.h b/headers/posix/wchar.h
index f0aa8c006c..d2bebb9213 100644
--- a/headers/posix/wchar.h
+++ b/headers/posix/wchar.h
@@ -62,7 +62,7 @@ extern wint_t	getwc(FILE *stream);
 extern wint_t	getwchar(void);
 
 extern size_t 	mbrlen(const char *s, size_t n, mbstate_t *mbState);
-extern size_t 	mbrtowc(wchar_t *dest, const char *src, size_t destLength,
+extern size_t 	mbrtowc(wchar_t *dest, const char *src, size_t srcLength,
 					mbstate_t *mbState);
 extern int		mbsinit(const mbstate_t *mbState);
 extern size_t	mbsnrtowcs(wchar_t *dest, const char **src, size_t srcLength,
diff --git a/headers/private/libroot/wchar_private.h b/headers/private/libroot/wchar_private.h
index fc276e6ba3..5f232c3dc6 100644
--- a/headers/private/libroot/wchar_private.h
+++ b/headers/private/libroot/wchar_private.h
@@ -19,7 +19,7 @@ extern wint_t	__btowc(int c);
 
 extern int		__mblen(const char *string, size_t length);
 extern size_t 	__mbrlen(const char *s, size_t n, mbstate_t *mbState);
-extern size_t 	__mbrtowc(wchar_t *dest, const char *src, size_t destLength,
+extern size_t 	__mbrtowc(wchar_t *dest, const char *src, size_t srcLength,
 					mbstate_t *mbState);
 extern int		__mbsinit(const mbstate_t *mbState);
 extern size_t	__mbsnrtowcs(wchar_t *dest, const char **src, size_t srcLength,