diff --git a/win32/dir.h b/win32/dir.h
index de12f79158..0292c27c9c 100644
--- a/win32/dir.h
+++ b/win32/dir.h
@@ -1,7 +1,7 @@
 #ifndef RUBY_WIN32_DIR_H
 #define RUBY_WIN32_DIR_H
 #include <stdint.h>             /* for uint8_t */
-#include <esent.h>              /* for WCHAR */
+#include <basetsd.h>            /* for WCHAR */
 #include "ruby/encoding.h"      /* for rb_encoding */
 
 #define DT_UNKNOWN 0