diff --git a/dlls/api-ms-win-crt-string-l1-1-0/api-ms-win-crt-string-l1-1-0.spec b/dlls/api-ms-win-crt-string-l1-1-0/api-ms-win-crt-string-l1-1-0.spec
index 920d962ba62..0a61576bb69 100644
--- a/dlls/api-ms-win-crt-string-l1-1-0/api-ms-win-crt-string-l1-1-0.spec
+++ b/dlls/api-ms-win-crt-string-l1-1-0/api-ms-win-crt-string-l1-1-0.spec
@@ -33,7 +33,7 @@
 @ cdecl _iswpunct_l(long ptr) ucrtbase._iswpunct_l
 @ cdecl _iswspace_l(long ptr) ucrtbase._iswspace_l
 @ cdecl _iswupper_l(long ptr) ucrtbase._iswupper_l
-@ stub _iswxdigit_l
+@ cdecl _iswxdigit_l(long ptr) ucrtbase._iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) ucrtbase._isxdigit_l
 @ cdecl _memccpy(ptr ptr long long) ucrtbase._memccpy
 @ cdecl _memicmp(str str long) ucrtbase._memicmp
diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index de81eb88bef..151d6ae5afc 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -1029,7 +1029,7 @@
 @ cdecl _iswpunct_l(long ptr) MSVCRT__iswpunct_l
 @ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ cdecl _iswupper_l(long ptr) MSVCRT__iswupper_l
-@ stub _iswxdigit_l
+@ cdecl _iswxdigit_l(long ptr) MSVCRT__iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
 @ cdecl _itoa(long ptr long) MSVCRT__itoa
 @ cdecl _itoa_s(long ptr long long) MSVCRT__itoa_s
diff --git a/dlls/msvcr110/msvcr110.spec b/dlls/msvcr110/msvcr110.spec
index 58e463250e3..abb6adafaa2 100644
--- a/dlls/msvcr110/msvcr110.spec
+++ b/dlls/msvcr110/msvcr110.spec
@@ -1375,7 +1375,7 @@
 @ cdecl _iswpunct_l(long ptr) MSVCRT__iswpunct_l
 @ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ cdecl _iswupper_l(long ptr) MSVCRT__iswupper_l
-@ stub _iswxdigit_l
+@ cdecl _iswxdigit_l(long ptr) MSVCRT__iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
 @ cdecl _itoa(long ptr long) MSVCRT__itoa
 @ cdecl _itoa_s(long ptr long long) MSVCRT__itoa_s
diff --git a/dlls/msvcr120/msvcr120.spec b/dlls/msvcr120/msvcr120.spec
index db49594c54a..8b7b154a0f1 100644
--- a/dlls/msvcr120/msvcr120.spec
+++ b/dlls/msvcr120/msvcr120.spec
@@ -1381,7 +1381,7 @@
 @ cdecl _iswpunct_l(long ptr) MSVCRT__iswpunct_l
 @ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ cdecl _iswupper_l(long ptr) MSVCRT__iswupper_l
-@ stub _iswxdigit_l
+@ cdecl _iswxdigit_l(long ptr) MSVCRT__iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
 @ cdecl _itoa(long ptr long) MSVCRT__itoa
 @ cdecl _itoa_s(long ptr long long) MSVCRT__itoa_s
diff --git a/dlls/msvcr120_app/msvcr120_app.spec b/dlls/msvcr120_app/msvcr120_app.spec
index 749deb816ad..d293900ead2 100644
--- a/dlls/msvcr120_app/msvcr120_app.spec
+++ b/dlls/msvcr120_app/msvcr120_app.spec
@@ -1246,7 +1246,7 @@
 @ cdecl _iswpunct_l(long ptr) msvcr120._iswpunct_l
 @ cdecl _iswspace_l(long ptr) msvcr120._iswspace_l
 @ cdecl _iswupper_l(long ptr) msvcr120._iswupper_l
-@ stub _iswxdigit_l
+@ cdecl _iswxdigit_l(long ptr) msvcr120._iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) msvcr120._isxdigit_l
 @ cdecl _itoa(long ptr long) msvcr120._itoa
 @ cdecl _itoa_s(long ptr long long) msvcr120._itoa_s
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index 8004353b661..aa89792adbd 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -701,7 +701,7 @@
 @ cdecl _iswpunct_l(long ptr) MSVCRT__iswpunct_l
 @ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ cdecl _iswupper_l(long ptr) MSVCRT__iswupper_l
-@ stub _iswxdigit_l
+@ cdecl _iswxdigit_l(long ptr) MSVCRT__iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
 @ cdecl _itoa(long ptr long) MSVCRT__itoa
 @ cdecl _itoa_s(long ptr long long) MSVCRT__itoa_s
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index bf0fc974384..cf604b7ad67 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -679,7 +679,7 @@
 @ cdecl _iswpunct_l(long ptr) MSVCRT__iswpunct_l
 @ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ cdecl _iswupper_l(long ptr) MSVCRT__iswupper_l
-@ stub _iswxdigit_l
+@ cdecl _iswxdigit_l(long ptr) MSVCRT__iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
 @ cdecl _itoa(long ptr long) MSVCRT__itoa
 @ cdecl _itoa_s(long ptr long long) MSVCRT__itoa_s
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index e38647f0e5f..e4d0aad8fbb 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -644,7 +644,7 @@
 @ cdecl _iswpunct_l(long ptr) MSVCRT__iswpunct_l
 @ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ cdecl _iswupper_l(long ptr) MSVCRT__iswupper_l
-# stub _iswxdigit_l(long ptr)
+@ cdecl _iswxdigit_l(long ptr) MSVCRT__iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
 @ cdecl _itoa(long ptr long) MSVCRT__itoa
 @ cdecl _itoa_s(long ptr long long) MSVCRT__itoa_s
diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index caf9b6a908b..27c9eb8740f 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -1966,6 +1966,14 @@ INT CDECL MSVCRT_iswxdigit( MSVCRT_wchar_t wc )
     return isxdigitW( wc );
 }
 
+/*********************************************************************
+ *		_iswxdigit_l (MSVCRT.@)
+ */
+int CDECL MSVCRT__iswxdigit_l( MSVCRT_wchar_t wc, MSVCRT__locale_t locale )
+{
+    return isxdigitW( wc );
+}
+
 /*********************************************************************
  *		_iswctype_l (MSVCRT.@)
  */
diff --git a/dlls/ucrtbase/ucrtbase.spec b/dlls/ucrtbase/ucrtbase.spec
index d68ce7c1c05..1f0975d9392 100644
--- a/dlls/ucrtbase/ucrtbase.spec
+++ b/dlls/ucrtbase/ucrtbase.spec
@@ -520,7 +520,7 @@
 @ cdecl _iswpunct_l(long ptr) MSVCRT__iswpunct_l
 @ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ cdecl _iswupper_l(long ptr) MSVCRT__iswupper_l
-@ stub _iswxdigit_l
+@ cdecl _iswxdigit_l(long ptr) MSVCRT__iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
 @ cdecl _itoa(long ptr long) MSVCRT__itoa
 @ cdecl _itoa_s(long ptr long long) MSVCRT__itoa_s