diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index b7d4945dfd4..9b474018ce9 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -657,7 +657,7 @@
 @ extern __setlc_active MSVCRT___setlc_active
 @ cdecl __setusermatherr(ptr) MSVCRT___setusermatherr
 @ stub __strncnt
-@ stub __swprintf_l
+@ varargs  __swprintf_l(ptr wstr ptr) MSVCRT___swprintf_l
 @ cdecl __sys_errlist()
 @ cdecl __sys_nerr()
 @ cdecl __threadhandle() kernel32.GetCurrentThread
diff --git a/dlls/msvcr110/msvcr110.spec b/dlls/msvcr110/msvcr110.spec
index c7222b9171a..e99df427f42 100644
--- a/dlls/msvcr110/msvcr110.spec
+++ b/dlls/msvcr110/msvcr110.spec
@@ -1005,7 +1005,7 @@
 @ extern __setlc_active MSVCRT___setlc_active
 @ cdecl __setusermatherr(ptr) MSVCRT___setusermatherr
 @ stub __strncnt
-@ stub __swprintf_l
+@ varargs  __swprintf_l(ptr wstr ptr) MSVCRT___swprintf_l
 @ cdecl __sys_errlist()
 @ cdecl __sys_nerr()
 @ cdecl __threadhandle() kernel32.GetCurrentThread
diff --git a/dlls/msvcr120/msvcr120.spec b/dlls/msvcr120/msvcr120.spec
index 1a1470e6aef..2beb51b7084 100644
--- a/dlls/msvcr120/msvcr120.spec
+++ b/dlls/msvcr120/msvcr120.spec
@@ -993,7 +993,7 @@
 @ extern __setlc_active MSVCRT___setlc_active
 @ cdecl __setusermatherr(ptr) MSVCRT___setusermatherr
 @ stub __strncnt
-@ stub __swprintf_l
+@ varargs  __swprintf_l(ptr wstr ptr) MSVCRT___swprintf_l
 @ cdecl __sys_errlist()
 @ cdecl __sys_nerr()
 @ cdecl __threadhandle() kernel32.GetCurrentThread
diff --git a/dlls/msvcr120_app/msvcr120_app.spec b/dlls/msvcr120_app/msvcr120_app.spec
index f47f906f9dd..e262aa97cf3 100644
--- a/dlls/msvcr120_app/msvcr120_app.spec
+++ b/dlls/msvcr120_app/msvcr120_app.spec
@@ -966,7 +966,7 @@
 @ extern __setlc_active msvcr120.__setlc_active
 @ cdecl __setusermatherr(ptr) msvcr120.__setusermatherr
 @ stub __strncnt
-@ stub __swprintf_l
+@ varargs __swprintf_l(ptr wstr ptr) msvcr120.__swprintf_l
 @ cdecl __sys_errlist() msvcr120.__sys_errlist
 @ cdecl __sys_nerr() msvcr120.__sys_nerr
 @ cdecl __threadhandle() msvcr120.__threadhandle
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index 8b40e2e3046..e3de8ac7c63 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -306,7 +306,7 @@
 @ extern __setlc_active MSVCRT___setlc_active
 @ cdecl __setusermatherr(ptr) MSVCRT___setusermatherr
 @ stub __strncnt
-@ stub __swprintf_l
+@ varargs  __swprintf_l(ptr wstr ptr) MSVCRT___swprintf_l
 @ cdecl __sys_errlist()
 @ cdecl __sys_nerr()
 @ cdecl __threadhandle() kernel32.GetCurrentThread
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index 5c65b2f3f6f..2de0526f3d0 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -290,7 +290,7 @@
 @ extern __setlc_active MSVCRT___setlc_active
 @ cdecl __setusermatherr(ptr) MSVCRT___setusermatherr
 @ stub __strncnt
-@ stub __swprintf_l
+@ varargs  __swprintf_l(ptr wstr ptr) MSVCRT___swprintf_l
 @ cdecl __sys_errlist()
 @ cdecl __sys_nerr()
 @ cdecl __threadhandle() kernel32.GetCurrentThread
diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index 98bc686dfb6..913b0a796bb 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -1294,6 +1294,20 @@ int CDECL MSVCRT_sprintf_p_l(char *buffer, MSVCRT_size_t length,
     return r;
 }
 
+/*********************************************************************
+ *		__swprintf_l (MSVCRT.@)
+ */
+int CDECL MSVCRT___swprintf_l( MSVCRT_wchar_t *str, const MSVCRT_wchar_t *format,
+        MSVCRT__locale_t locale, ...)
+{
+    int retval;
+    __ms_va_list valist;
+    __ms_va_start(valist, locale);
+    retval = MSVCRT_vswprintf_l(str, format, locale, valist);
+    __ms_va_end(valist);
+    return retval;
+}
+
 /*********************************************************************
  * _sprintf_p (MSVCR100.@)
  */