diff --git a/src/fios.cpp b/src/fios.cpp
index 67d225f768..2145378a3b 100644
--- a/src/fios.cpp
+++ b/src/fios.cpp
@@ -18,6 +18,9 @@
 
 #ifdef WIN32
 # include <tchar.h>
+# ifndef UNICODE
+#  include <io.h>
+# endif
 # define access _taccess
 # define unlink _tunlink
 #else