diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c
index 99dac84..4c08e51 100644
--- a/src/backend/storage/file/fd.c
+++ b/src/backend/storage/file/fd.c
@@ -2509,7 +2509,7 @@ walkdir(char *path, void (*action) (char *fname, bool isdir))
 #ifndef WIN32
 		else if (S_ISLNK(fst.st_mode))
 #else
-		else if (pg_win32_is_junction(subpath))
+		else if (pgwin32_is_junction(subpath))
 #endif
 		{
 #if defined(HAVE_READLINK) || defined(WIN32)
diff --git a/src/include/port.h b/src/include/port.h
index 3787cbf..2082a64 100644
--- a/src/include/port.h
+++ b/src/include/port.h
@@ -285,7 +285,13 @@ extern int	pgwin32_open(const char *, int,...);
 extern FILE *pgwin32_fopen(const char *, const char *);
 
 #ifndef FRONTEND
-#define		open(a,b,c) pgwin32_open(a,b,c)
+
+#ifdef HAVE__VA_ARGS
+#define		open(a,b,...) pgwin32_open(a,b,__VA_ARGS__)
+#else
+#define		open pgwin32_open
+#endif /* HAVE__VA_ARGS */
+
 #define		fopen(a,b) pgwin32_fopen(a,b)
 #endif