diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c
index 34d1176a7a0..a55b6e8ac5d 100644
--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -2851,7 +2851,7 @@ int MSVCRT_vfprintf(MSVCRT_FILE* file, const char *format, va_list valist)
    * Return the number of bytes that would have been written
    * The code below handles both cases
    */
-  while ((written = vsnprintf(mem, resize, format, valist)) == -1 ||
+  while ((written = MSVCRT_vsnprintf(mem, resize, format, valist)) == -1 ||
           written > resize)
   {
     resize = (written == -1 ? resize * 2 : written + 1);
diff --git a/dlls/msvcrt/msvcrt.h b/dlls/msvcrt/msvcrt.h
index 54c78e4fc5c..b6d463740b2 100644
--- a/dlls/msvcrt/msvcrt.h
+++ b/dlls/msvcrt/msvcrt.h
@@ -576,6 +576,7 @@ double         MSVCRT_difftime(MSVCRT_time_t time1, MSVCRT_time_t time2);
 MSVCRT_time_t  MSVCRT_time(MSVCRT_time_t*);
 void *         MSVCRT___p__daylight(void);
 MSVCRT_FILE*   MSVCRT__fdopen(int, const char *);
+int            MSVCRT_vsnprintf(char *str, unsigned int len, const char *format, va_list valist);
 
 #ifndef __WINE_MSVCRT_TEST
 int            _write(int,const void*,unsigned int);