diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index ef49177..f963c3b 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -1436,11 +1436,11 @@
 @ cdecl _vfprintf_l(ptr str ptr ptr) MSVCRT__vfprintf_l
 @ stub _vfprintf_p
 @ stub _vfprintf_p_l
-@ stub _vfprintf_s_l
+@ cdecl _vfprintf_s_l(ptr str ptr ptr) MSVCRT__vfprintf_s_l
 @ cdecl _vfwprintf_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_l
 @ stub _vfwprintf_p
 @ stub _vfwprintf_p_l
-@ stub _vfwprintf_s_l
+@ cdecl _vfwprintf_s_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_s_l
 @ stub _vprintf_l
 @ stub _vprintf_p
 @ stub _vprintf_p_l
diff --git a/dlls/msvcr110/msvcr110.spec b/dlls/msvcr110/msvcr110.spec
index be4d8c1..721886e 100644
--- a/dlls/msvcr110/msvcr110.spec
+++ b/dlls/msvcr110/msvcr110.spec
@@ -1793,11 +1793,11 @@
 @ cdecl _vfprintf_l(ptr str ptr ptr) MSVCRT__vfprintf_l
 @ stub _vfprintf_p
 @ stub _vfprintf_p_l
-@ stub _vfprintf_s_l
+@ cdecl _vfprintf_s_l(ptr str ptr ptr) MSVCRT__vfprintf_s_l
 @ cdecl _vfwprintf_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_l
 @ stub _vfwprintf_p
 @ stub _vfwprintf_p_l
-@ stub _vfwprintf_s_l
+@ cdecl _vfwprintf_s_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_s_l
 @ stub _vprintf_l
 @ stub _vprintf_p
 @ stub _vprintf_p_l
diff --git a/dlls/msvcr120/msvcr120.spec b/dlls/msvcr120/msvcr120.spec
index 60e0a32..2416144 100644
--- a/dlls/msvcr120/msvcr120.spec
+++ b/dlls/msvcr120/msvcr120.spec
@@ -1811,11 +1811,11 @@
 @ cdecl _vfprintf_l(ptr str ptr ptr) MSVCRT__vfprintf_l
 @ stub _vfprintf_p
 @ stub _vfprintf_p_l
-@ stub _vfprintf_s_l
+@ cdecl _vfprintf_s_l(ptr str ptr ptr) MSVCRT__vfprintf_s_l
 @ cdecl _vfwprintf_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_l
 @ stub _vfwprintf_p
 @ stub _vfwprintf_p_l
-@ stub _vfwprintf_s_l
+@ cdecl _vfwprintf_s_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_s_l
 @ stub _vprintf_l
 @ stub _vprintf_p
 @ stub _vprintf_p_l
diff --git a/dlls/msvcr120_app/msvcr120_app.spec b/dlls/msvcr120_app/msvcr120_app.spec
index 38c2707..fc7f72c 100644
--- a/dlls/msvcr120_app/msvcr120_app.spec
+++ b/dlls/msvcr120_app/msvcr120_app.spec
@@ -1505,11 +1505,11 @@
 @ cdecl _vfprintf_l(ptr str ptr ptr) msvcr120._vfprintf_l
 @ stub _vfprintf_p
 @ stub _vfprintf_p_l
-@ stub _vfprintf_s_l
+@ cdecl _vfprintf_s_l(ptr str ptr ptr) msvcr120._vfprintf_s_l
 @ cdecl _vfwprintf_l(ptr wstr ptr ptr) msvcr120._vfwprintf_l
 @ stub _vfwprintf_p
 @ stub _vfwprintf_p_l
-@ stub _vfwprintf_s_l
+@ cdecl _vfwprintf_s_l(ptr wstr ptr ptr) msvcr120._vfwprintf_s_l
 @ stub _vprintf_l
 @ stub _vprintf_p
 @ stub _vprintf_p_l
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index 4d97db0..1f87e2a 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -1115,11 +1115,11 @@
 @ cdecl _vfprintf_l(ptr str ptr ptr) MSVCRT__vfprintf_l
 @ stub _vfprintf_p
 @ stub _vfprintf_p_l
-@ stub _vfprintf_s_l
+@ cdecl _vfprintf_s_l(ptr str ptr ptr) MSVCRT__vfprintf_s_l
 @ cdecl _vfwprintf_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_l
 @ stub _vfwprintf_p
 @ stub _vfwprintf_p_l
-@ stub _vfwprintf_s_l
+@ cdecl _vfwprintf_s_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_s_l
 @ stub _vprintf_l
 @ stub _vprintf_p
 @ stub _vprintf_p_l
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index eccbf3c..f63f979 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -1091,11 +1091,11 @@
 @ cdecl _vfprintf_l(ptr str ptr ptr) MSVCRT__vfprintf_l
 @ stub _vfprintf_p
 @ stub _vfprintf_p_l
-@ stub _vfprintf_s_l
+@ cdecl _vfprintf_s_l(ptr str ptr ptr) MSVCRT__vfprintf_s_l
 @ cdecl _vfwprintf_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_l
 @ stub _vfwprintf_p
 @ stub _vfwprintf_p_l
-@ stub _vfwprintf_s_l
+@ cdecl _vfwprintf_s_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_s_l
 @ stub _vprintf_l
 @ stub _vprintf_p
 @ stub _vprintf_p_l
diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c
index db8cd5c..0746cf2 100644
--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -5085,6 +5085,24 @@
 }
 
 /*********************************************************************
+ *    _vfprintf_s_l (MSVCRT.@)
+ */
+int CDECL MSVCRT__vfprintf_s_l(MSVCRT_FILE* file, const char *format,
+        MSVCRT__locale_t locale, __ms_va_list valist)
+{
+    return vfprintf_helper(MSVCRT_PRINTF_INVOKE_INVALID_PARAM_HANDLER, file, format, locale, valist);
+}
+
+/*********************************************************************
+ *    _vfwprintf_s_l (MSVCRT.@)
+ */
+int CDECL MSVCRT__vfwprintf_s_l(MSVCRT_FILE* file, const MSVCRT_wchar_t *format,
+        MSVCRT__locale_t locale, __ms_va_list valist)
+{
+    return vfwprintf_helper(MSVCRT_PRINTF_INVOKE_INVALID_PARAM_HANDLER, file, format, locale, valist);
+}
+
+/*********************************************************************
  *		vfprintf (MSVCRT.@)
  */
 int CDECL MSVCRT_vfprintf(MSVCRT_FILE* file, const char *format, __ms_va_list valist)
@@ -5097,7 +5115,7 @@
  */
 int CDECL MSVCRT_vfprintf_s(MSVCRT_FILE* file, const char *format, __ms_va_list valist)
 {
-    return vfprintf_helper(MSVCRT_PRINTF_INVOKE_INVALID_PARAM_HANDLER, file, format, NULL, valist);
+    return MSVCRT__vfprintf_s_l(file, format, NULL, valist);
 }
 
 /*********************************************************************
@@ -5113,7 +5131,7 @@
  */
 int CDECL MSVCRT_vfwprintf_s(MSVCRT_FILE* file, const MSVCRT_wchar_t *format, __ms_va_list valist)
 {
-    return vfwprintf_helper(MSVCRT_PRINTF_INVOKE_INVALID_PARAM_HANDLER, file, format, NULL, valist);
+    return MSVCRT__vfwprintf_s_l(file, format, NULL, valist);
 }
 
 /*********************************************************************
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index 50d051d..fcfa8fc 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -1047,11 +1047,11 @@
 @ cdecl _vfprintf_l(ptr str ptr ptr) MSVCRT__vfprintf_l
 # stub _vfprintf_p(ptr str ptr)
 # stub _vfprintf_p_l(ptr str ptr ptr)
-# stub _vfprintf_s_l(ptr str ptr ptr)
+@ cdecl _vfprintf_s_l(ptr str ptr ptr) MSVCRT__vfprintf_s_l
 @ cdecl _vfwprintf_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_l
 # stub _vfwprintf_p(ptr wstr ptr)
 # stub _vfwprintf_p_l(ptr wstr ptr ptr)
-# stub _vfwprintf_s_l(ptr wstr ptr ptr)
+@ cdecl _vfwprintf_s_l(ptr wstr ptr ptr) MSVCRT__vfwprintf_s_l
 # stub _vprintf_l(str ptr ptr)
 # stub _vprintf_p(str ptr)
 # stub _vprintf_p_l(str ptr ptr)