diff --git a/mingw-w64-crt/Makefile.am b/mingw-w64-crt/Makefile.am
index 498b673..d2347cc 100644
--- a/mingw-w64-crt/Makefile.am
+++ b/mingw-w64-crt/Makefile.am
@@ -1114,7 +1114,6 @@
   math/powi.def.h       math/sqrt.def.h    \
   math/cephes_mconf.h   math/fp_consts.h   \
   \
-  misc/mb_wc_common.h \
   misc/mingw_longjmp.S \
   misc/mingw_getsp.S \
   misc/alarm.c \
diff --git a/mingw-w64-crt/misc/btowc.c b/mingw-w64-crt/misc/btowc.c
index caf2d95..2029edc 100644
--- a/mingw-w64-crt/misc/btowc.c
+++ b/mingw-w64-crt/misc/btowc.c
@@ -6,7 +6,7 @@
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
-#include "mb_wc_common.h"
+#include <locale.h>
 #include <limits.h>
 #include <wchar.h>
 #include <stdio.h>
diff --git a/mingw-w64-crt/misc/mb_wc_common.h b/mingw-w64-crt/misc/mb_wc_common.h
deleted file mode 100644
index c640fb7..0000000
--- a/mingw-w64-crt/misc/mb_wc_common.h
+++ /dev/null
@@ -1,9 +0,0 @@
-/**
- * This file has no copyright assigned and is placed in the Public Domain.
- * This file is part of the mingw-w64 runtime package.
- * No warranty is given; refer to the file DISCLAIMER.PD within this package.
- */
-
-#include <_mingw.h>
-
-unsigned int __cdecl ___lc_codepage_func(void);
diff --git a/mingw-w64-crt/misc/mbrtowc.c b/mingw-w64-crt/misc/mbrtowc.c
index f53286e..200711c 100644
--- a/mingw-w64-crt/misc/mbrtowc.c
+++ b/mingw-w64-crt/misc/mbrtowc.c
@@ -6,7 +6,7 @@
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
-#include "mb_wc_common.h"
+#include <locale.h>
 #include <wchar.h>
 #include <stdlib.h>
 #include <errno.h>
diff --git a/mingw-w64-crt/misc/mingw_wcstold.c b/mingw-w64-crt/misc/mingw_wcstold.c
index 2f66bee..407e169 100644
--- a/mingw-w64-crt/misc/mingw_wcstold.c
+++ b/mingw-w64-crt/misc/mingw_wcstold.c
@@ -23,8 +23,6 @@
 #include <string.h>
 #include <mbstring.h>
 
-#include "mb_wc_common.h"
-
 long double __mingw_wcstold (const wchar_t * __restrict__ wcs, wchar_t ** __restrict__ wcse)
 {
   char * cs;
diff --git a/mingw-w64-crt/misc/wcrtomb.c b/mingw-w64-crt/misc/wcrtomb.c
index 9f869e8..71ded9c 100644
--- a/mingw-w64-crt/misc/wcrtomb.c
+++ b/mingw-w64-crt/misc/wcrtomb.c
@@ -6,7 +6,7 @@
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
-#include "mb_wc_common.h"
+#include <locale.h>
 #include <wchar.h>
 #include <stdlib.h>
 #include <errno.h>
diff --git a/mingw-w64-crt/misc/wcstof.c b/mingw-w64-crt/misc/wcstof.c
index 7673338..0e73c5c 100644
--- a/mingw-w64-crt/misc/wcstof.c
+++ b/mingw-w64-crt/misc/wcstof.c
@@ -15,8 +15,6 @@
 #include <string.h>
 #include <mbstring.h>
 
-#include "mb_wc_common.h"
-
 float wcstof (const wchar_t * __restrict__ wcs, wchar_t ** __restrict__ wcse)
 {
   char * cs;
diff --git a/mingw-w64-crt/misc/wctob.c b/mingw-w64-crt/misc/wctob.c
index 2fe6661..57f6170 100644
--- a/mingw-w64-crt/misc/wctob.c
+++ b/mingw-w64-crt/misc/wctob.c
@@ -6,7 +6,7 @@
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
-#include "mb_wc_common.h"
+#include <locale.h>
 #include <limits.h>
 #include <wchar.h>
 #include <stdio.h>