diff --git a/src/mrw/file.hxx b/src/mrw/file.hxx
index 97c3866..e1ed102 100644
--- a/src/mrw/file.hxx
+++ b/src/mrw/file.hxx
@@ -360,7 +360,11 @@ namespace mrw {
       operator bool() throw() {
         static const std::string D("."), DD("..");
         static dirent* fake;
-        if (readdir_r(_dir, &_entry.entry(), &fake) || !fake) return false;
+#       if defined(WIN32) || defined(_WIN32) || defined(__MINGW32__)
+          if (!(_entry.entry()=readdir(_dir))) return false;
+#       else
+          if (readdir_r(_dir, &_entry.entry(), &fake) || !fake) return false;
+#       endif
         if (_ignoreDots
             && (_entry.type()==Entry::UNKNOWN || _entry.type()==Entry::DIR)
             && (D==_entry() || DD==_entry()))