diff --git a/dlls/msvcrt/dir.c b/dlls/msvcrt/dir.c
index ef32d046f51..9c91a3cc7ed 100644
--- a/dlls/msvcrt/dir.c
+++ b/dlls/msvcrt/dir.c
@@ -587,7 +587,7 @@ static void wmsvcrt_fln_fix(MSVCRT_wchar_t *path)
 /*********************************************************************
  *		_wfullpath (MSVCRT.@)
  */
-MSVCRT_wchar_t *_wfullpath(MSVCRT_wchar_t * absPath, const MSVCRT_wchar_t* relPath, unsigned int size)
+MSVCRT_wchar_t *_wfullpath(MSVCRT_wchar_t * absPath, const MSVCRT_wchar_t* relPath, MSVCRT_size_t size)
 {
   MSVCRT_wchar_t drive[5],dir[MAX_PATH],file[MAX_PATH],ext[MAX_PATH];
   MSVCRT_wchar_t res[MAX_PATH];
diff --git a/include/msvcrt/stdlib.h b/include/msvcrt/stdlib.h
index 7b640a2fb1c..35a90364a47 100644
--- a/include/msvcrt/stdlib.h
+++ b/include/msvcrt/stdlib.h
@@ -203,7 +203,7 @@ MSVCRT(wchar_t)*_i64tow(__int64,MSVCRT(wchar_t)*,int);
 MSVCRT(wchar_t)*_ltow(long,MSVCRT(wchar_t)*,int);
 MSVCRT(wchar_t)*_ui64tow(unsigned __int64,MSVCRT(wchar_t)*,int);
 MSVCRT(wchar_t)*_ultow(unsigned long,MSVCRT(wchar_t)*,int);
-MSVCRT(wchar_t)*_wfullpath(MSVCRT(wchar_t)*,const MSVCRT(wchar_t)*,size_t);
+MSVCRT(wchar_t)*_wfullpath(MSVCRT(wchar_t)*,const MSVCRT(wchar_t)*,MSVCRT(size_t));
 MSVCRT(wchar_t)*_wgetenv(const MSVCRT(wchar_t)*);
 void            _wmakepath(MSVCRT(wchar_t)*,const MSVCRT(wchar_t)*,const MSVCRT(wchar_t)*,const MSVCRT(wchar_t)*,const MSVCRT(wchar_t)*);
 void            _wperror(const MSVCRT(wchar_t)*);