diff --git a/rarfile.py b/rarfile.py
index 94a94d4..10056b1 100644
--- a/rarfile.py
+++ b/rarfile.py
@@ -1331,7 +1331,7 @@ def _open_unrar(self, rarfile, inf, pwd=None, tmpfile=None, force_file=False):
         # not giving filename avoids encoding related problems
         fn = None
         if not tmpfile or force_file:
-            fn = inf.filename
+            fn = inf.filename.replace("/", os.path.sep)
 
         # read from unrar pipe
         cmd = setup.open_cmdline(pwd, rarfile, fn)