diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index 581ff176299..ed40b65bd73 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -1490,10 +1490,10 @@
 @ cdecl _wcsicmp_l(wstr wstr ptr) MSVCRT__wcsicmp_l
 @ cdecl _wcsicoll(wstr wstr) MSVCRT__wcsicoll
 @ cdecl _wcsicoll_l(wstr wstr ptr) MSVCRT__wcsicoll_l
-@ cdecl _wcslwr(wstr) ntdll._wcslwr
-@ stub _wcslwr_l
+@ cdecl _wcslwr(wstr) MSVCRT__wcslwr
+@ cdecl _wcslwr_l(wstr ptr) MSVCRT__wcslwr_l
 @ cdecl _wcslwr_s(wstr long) MSVCRT__wcslwr_s
-@ stub _wcslwr_s_l
+@ cdecl _wcslwr_s_l(wstr long ptr) MSVCRT__wcslwr_s_l
 @ cdecl _wcsncoll(wstr wstr long) MSVCRT__wcsncoll
 @ cdecl _wcsncoll_l(wstr wstr long ptr) MSVCRT__wcsncoll_l
 @ cdecl _wcsnicmp(wstr wstr long) MSVCRT__wcsnicmp
diff --git a/dlls/msvcr110/msvcr110.spec b/dlls/msvcr110/msvcr110.spec
index 9973aa0c95a..8af410c58d1 100644
--- a/dlls/msvcr110/msvcr110.spec
+++ b/dlls/msvcr110/msvcr110.spec
@@ -1849,10 +1849,10 @@
 @ cdecl _wcsicmp_l(wstr wstr ptr) MSVCRT__wcsicmp_l
 @ cdecl _wcsicoll(wstr wstr) MSVCRT__wcsicoll
 @ cdecl _wcsicoll_l(wstr wstr ptr) MSVCRT__wcsicoll_l
-@ cdecl _wcslwr(wstr) ntdll._wcslwr
-@ stub _wcslwr_l
+@ cdecl _wcslwr(wstr) MSVCRT__wcslwr
+@ cdecl _wcslwr_l(wstr ptr) MSVCRT__wcslwr_l
 @ cdecl _wcslwr_s(wstr long) MSVCRT__wcslwr_s
-@ stub _wcslwr_s_l
+@ cdecl _wcslwr_s_l(wstr long ptr) MSVCRT__wcslwr_s_l
 @ cdecl _wcsncoll(wstr wstr long) MSVCRT__wcsncoll
 @ cdecl _wcsncoll_l(wstr wstr long ptr) MSVCRT__wcsncoll_l
 @ cdecl _wcsnicmp(wstr wstr long) MSVCRT__wcsnicmp
diff --git a/dlls/msvcr70/msvcr70.spec b/dlls/msvcr70/msvcr70.spec
index cf3e236ab39..016835955ac 100644
--- a/dlls/msvcr70/msvcr70.spec
+++ b/dlls/msvcr70/msvcr70.spec
@@ -598,7 +598,7 @@
 @ cdecl _wcserror(long) MSVCRT__wcserror
 @ cdecl _wcsicmp(wstr wstr) MSVCRT__wcsicmp
 @ cdecl _wcsicoll(wstr wstr) MSVCRT__wcsicoll
-@ cdecl _wcslwr(wstr) ntdll._wcslwr
+@ cdecl _wcslwr(wstr) MSVCRT__wcslwr
 @ cdecl _wcsncoll(wstr wstr long) MSVCRT__wcsncoll
 @ cdecl _wcsnicmp(wstr wstr long) MSVCRT__wcsnicmp
 @ cdecl _wcsnicoll(wstr wstr long) MSVCRT__wcsnicoll
diff --git a/dlls/msvcr71/msvcr71.spec b/dlls/msvcr71/msvcr71.spec
index 2912b2d6c08..f5ff608b262 100644
--- a/dlls/msvcr71/msvcr71.spec
+++ b/dlls/msvcr71/msvcr71.spec
@@ -594,7 +594,7 @@
 @ cdecl _wcserror(long) MSVCRT__wcserror
 @ cdecl _wcsicmp(wstr wstr) MSVCRT__wcsicmp
 @ cdecl _wcsicoll(wstr wstr) MSVCRT__wcsicoll
-@ cdecl _wcslwr(wstr) ntdll._wcslwr
+@ cdecl _wcslwr(wstr) MSVCRT__wcslwr
 @ cdecl _wcsncoll(wstr wstr long) MSVCRT__wcsncoll
 @ cdecl _wcsnicmp(wstr wstr long) MSVCRT__wcsnicmp
 @ cdecl _wcsnicoll(wstr wstr long) MSVCRT__wcsnicoll
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index c76465bfeef..1898d1153f4 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -1169,10 +1169,10 @@
 @ cdecl _wcsicmp_l(wstr wstr ptr) MSVCRT__wcsicmp_l
 @ cdecl _wcsicoll(wstr wstr) MSVCRT__wcsicoll
 @ cdecl _wcsicoll_l(wstr wstr ptr) MSVCRT__wcsicoll_l
-@ cdecl _wcslwr(wstr) ntdll._wcslwr
-@ stub _wcslwr_l
+@ cdecl _wcslwr(wstr) MSVCRT__wcslwr
+@ cdecl _wcslwr_l(wstr ptr) MSVCRT__wcslwr_l
 @ cdecl _wcslwr_s(wstr long) MSVCRT__wcslwr_s
-@ stub _wcslwr_s_l
+@ cdecl _wcslwr_s_l(wstr long ptr) MSVCRT__wcslwr_s_l
 @ cdecl _wcsncoll(wstr wstr long) MSVCRT__wcsncoll
 @ cdecl _wcsncoll_l(wstr wstr long ptr) MSVCRT__wcsncoll_l
 @ cdecl _wcsnicmp(wstr wstr long) MSVCRT__wcsnicmp
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index 622b9f40826..b4ea4b8721e 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -1145,10 +1145,10 @@
 @ cdecl _wcsicmp_l(wstr wstr ptr) MSVCRT__wcsicmp_l
 @ cdecl _wcsicoll(wstr wstr) MSVCRT__wcsicoll
 @ cdecl _wcsicoll_l(wstr wstr ptr) MSVCRT__wcsicoll_l
-@ cdecl _wcslwr(wstr) ntdll._wcslwr
-@ stub _wcslwr_l
+@ cdecl _wcslwr(wstr) MSVCRT__wcslwr
+@ cdecl _wcslwr_l(wstr ptr) MSVCRT__wcslwr_l
 @ cdecl _wcslwr_s(wstr long) MSVCRT__wcslwr_s
-@ stub _wcslwr_s_l
+@ cdecl _wcslwr_s_l(wstr long ptr) MSVCRT__wcslwr_s_l
 @ cdecl _wcsncoll(wstr wstr long) MSVCRT__wcsncoll
 @ cdecl _wcsncoll_l(wstr wstr long ptr) MSVCRT__wcsncoll_l
 @ cdecl _wcsnicmp(wstr wstr long) MSVCRT__wcsnicmp
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index cd7a39b9e2c..69020f66cd9 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -1106,10 +1106,10 @@
 @ cdecl _wcsicmp_l(wstr wstr ptr) MSVCRT__wcsicmp_l
 @ cdecl _wcsicoll(wstr wstr) MSVCRT__wcsicoll
 @ cdecl _wcsicoll_l(wstr wstr ptr) MSVCRT__wcsicoll_l
-@ cdecl _wcslwr(wstr) ntdll._wcslwr
-# stub _wcslwr_l(wstr ptr)
+@ cdecl _wcslwr(wstr) MSVCRT__wcslwr
+@ cdecl _wcslwr_l(wstr ptr) MSVCRT__wcslwr_l
 @ cdecl _wcslwr_s(wstr long) MSVCRT__wcslwr_s
-# stub _wcslwr_s_l(wstr long ptr)
+@ cdecl _wcslwr_s_l(wstr long ptr) MSVCRT__wcslwr_s_l
 @ cdecl _wcsncoll(wstr wstr long) MSVCRT__wcsncoll
 @ cdecl _wcsncoll_l(wstr wstr long ptr) MSVCRT__wcsncoll_l
 @ cdecl _wcsnicmp(wstr wstr long) MSVCRT__wcsnicmp
diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index 60a24a5b16e..548c90728eb 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -235,9 +235,9 @@ MSVCRT_wchar_t* CDECL MSVCRT__wcsupr_l( MSVCRT_wchar_t *str, MSVCRT__locale_t lo
 }
 
 /******************************************************************
- *		_wcslwr_s (MSVCRT.@)
+ *		_wcslwr_s_l (MSVCRT.@)
  */
-int CDECL MSVCRT__wcslwr_s( MSVCRT_wchar_t* str, MSVCRT_size_t n )
+int CDECL MSVCRT__wcslwr_s_l( MSVCRT_wchar_t* str, MSVCRT_size_t n, MSVCRT__locale_t locale )
 {
   MSVCRT_wchar_t* ptr = str;
 
@@ -262,6 +262,30 @@ int CDECL MSVCRT__wcslwr_s( MSVCRT_wchar_t* str, MSVCRT_size_t n )
   return MSVCRT_EINVAL;
 }
 
+/******************************************************************
+ *		_wcslwr_s (MSVCRT.@)
+ */
+int CDECL MSVCRT__wcslwr_s( MSVCRT_wchar_t* str, MSVCRT_size_t n )
+{
+    return MSVCRT__wcslwr_s_l(str, n, NULL);
+}
+
+/******************************************************************
+ *		_wcslwr_l (MSVCRT.@)
+ */
+int CDECL MSVCRT__wcslwr_l( MSVCRT_wchar_t* str, MSVCRT__locale_t locale )
+{
+    return MSVCRT__wcslwr_s_l(str, -1, locale);
+}
+
+/******************************************************************
+ *		_wcslwr (MSVCRT.@)
+ */
+int CDECL MSVCRT__wcslwr( MSVCRT_wchar_t* str )
+{
+    return MSVCRT__wcslwr_s_l(str, -1, NULL);
+}
+
 /*********************************************************************
  *              _wcsncoll_l (MSVCRT.@)
  */