diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index 38ec0e1353d..99d6c3d63bc 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -1099,7 +1099,7 @@
 @ varargs _snscanf_s(str long str) msvcrt._snscanf_s
 @ varargs _snscanf_s_l(str long str ptr) msvcrt._snscanf_s_l
 @ varargs _snwprintf(ptr long wstr) msvcrt._snwprintf
-@ stub _snwprintf_l
+@ varargs _snwprintf_l(ptr long wstr ptr) msvcrt._snwprintf_l
 @ varargs _snwprintf_s(ptr long long wstr) msvcrt._snwprintf_s
 @ stub _snwprintf_s_l
 @ varargs _snwscanf(wstr long wstr) msvcrt._snwscanf
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index a083053229c..ca284bf655c 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -953,7 +953,7 @@
 @ varargs _snscanf_s(str long str) msvcrt._snscanf_s
 @ varargs _snscanf_s_l(str long str ptr) msvcrt._snscanf_s_l
 @ varargs _snwprintf(ptr long wstr) msvcrt._snwprintf
-@ stub _snwprintf_l
+@ varargs _snwprintf_l(ptr long wstr ptr) msvcrt._snwprintf_l
 @ varargs _snwprintf_s(ptr long long wstr) msvcrt._snwprintf_s
 @ stub _snwprintf_s_l
 @ varargs _snwscanf(wstr long wstr) msvcrt._snwscanf
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index 475e3a932bc..2ede2cca2cd 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -946,7 +946,7 @@
 @ varargs _snscanf_s(str long str) msvcrt._snscanf_s
 @ varargs _snscanf_s_l(str long str ptr) msvcrt._snscanf_s_l
 @ varargs _snwprintf(ptr long wstr) msvcrt._snwprintf
-@ stub _snwprintf_l
+@ varargs _snwprintf_l(ptr long wstr ptr) msvcrt._snwprintf_l
 @ varargs _snwprintf_s(ptr long long wstr) msvcrt._snwprintf_s
 @ stub _snwprintf_s_l
 @ varargs _snwscanf(wstr long wstr) msvcrt._snwscanf
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index 75a3b354d7f..1260dfa5d68 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -890,7 +890,7 @@
 @ varargs _snscanf_s(str long str) MSVCRT__snscanf_s
 @ varargs _snscanf_s_l(str long str ptr) MSVCRT__snscanf_s_l
 @ varargs _snwprintf(ptr long wstr) MSVCRT__snwprintf
-# stub _snwprintf_l(ptr long wstr ptr)
+@ varargs _snwprintf_l(ptr long wstr ptr) MSVCRT__snwprintf_l
 @ varargs _snwprintf_s(ptr long long wstr) MSVCRT__snwprintf_s
 # stub _snwprintf_s_l(ptr long long wstr ptr)
 @ varargs _snwscanf(wstr long wstr) MSVCRT__snwscanf
diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index 17ff5321b8c..b6786cef421 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -777,6 +777,20 @@ int CDECL MSVCRT__snwprintf( MSVCRT_wchar_t *str, unsigned int len, const MSVCRT
     return retval;
 }
 
+/*********************************************************************
+ *		_snwprintf_l (MSVCRT.@)
+ */
+int CDECL MSVCRT__snwprintf_l( MSVCRT_wchar_t *str, unsigned int len, const MSVCRT_wchar_t *format,
+        MSVCRT__locale_t locale, ...)
+{
+    int retval;
+    __ms_va_list valist;
+    __ms_va_start(valist, locale);
+    retval = MSVCRT_vsnwprintf_l(str, len, format, locale, valist);
+    __ms_va_end(valist);
+    return retval;
+}
+
 /*********************************************************************
  *		_snwprintf_s (MSVCRT.@)
  */