diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index e6524d6a06e..b0b817204a5 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -1052,7 +1052,7 @@
 @ stub _snscanf_s_l
 @ varargs _snwprintf(ptr long wstr) msvcrt._snwprintf
 @ stub _snwprintf_l
-@ stub _snwprintf_s
+@ varargs _snwprintf_s(ptr long long wstr) msvcrt._snwprintf_s
 @ stub _snwprintf_s_l
 @ stub _snwscanf
 @ stub _snwscanf_l
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index db65318aa41..a8ba61e26ef 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -899,7 +899,7 @@
 @ stub _snscanf_s_l
 @ varargs _snwprintf(ptr long wstr) msvcrt._snwprintf
 @ stub _snwprintf_l
-@ stub _snwprintf_s
+@ varargs _snwprintf_s(ptr long long wstr) msvcrt._snwprintf_s
 @ stub _snwprintf_s_l
 @ stub _snwscanf
 @ stub _snwscanf_l
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index 1da6e823729..df65a5c0936 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -885,7 +885,7 @@
 @ stub _snscanf_s_l
 @ varargs _snwprintf(ptr long wstr) msvcrt._snwprintf
 @ stub _snwprintf_l
-@ stub _snwprintf_s
+@ varargs _snwprintf_s(ptr long long wstr) msvcrt._snwprintf_s
 @ stub _snwprintf_s_l
 @ stub _snwscanf
 @ stub _snwscanf_l
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index ff195193626..88a2ab981f6 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -838,7 +838,7 @@
 # stub _snscanf_s_l
 @ varargs _snwprintf(ptr long wstr) MSVCRT__snwprintf
 # stub _snwprintf_l
-# stub _snwprintf_s
+@ varargs _snwprintf_s(ptr long long wstr) MSVCRT__snwprintf_s
 # stub _snwprintf_s_l
 # stub _snwscanf
 # stub _snwscanf_l
diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index 9571928c19f..4485db33d2e 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -1204,6 +1204,20 @@ int CDECL MSVCRT__snwprintf( MSVCRT_wchar_t *str, unsigned int len, const MSVCRT
     return retval;
 }
 
+/*********************************************************************
+ *		_snwprintf_s (MSVCRT.@)
+ */
+int CDECL MSVCRT__snwprintf_s( MSVCRT_wchar_t *str, unsigned int len, unsigned int count,
+    const MSVCRT_wchar_t *format, ...)
+{
+    int retval;
+    __ms_va_list valist;
+    __ms_va_start(valist, format);
+    retval = MSVCRT_vsnwprintf_s_l(str, len, count, format, NULL, valist);
+    __ms_va_end(valist);
+    return retval;
+}
+
 /*********************************************************************
  *		sprintf (MSVCRT.@)
  */