1 files changed, 4 insertions, 0 deletions
diff --git a/win32/file.h b/win32/file.h
index ef701487dd..4f1f36a75c 100644
--- a/win32/file.h
+++ b/win32/file.h
@@ -1,6 +1,10 @@
 #ifndef RUBY_WIN32_FILE_H
 #define RUBY_WIN32_FILE_H
 
+#ifndef IO_REPARSE_TAG_AF_UNIX
+# define IO_REPARSE_TAG_AF_UNIX 0x80000023
+#endif
+
 enum {
     MINIMUM_REPARSE_BUFFER_PATH_LEN = 100
 };