diff --git a/pym/update/update.py b/pym/update/update.py
index 0bad4b0..ea7707c 100644
--- a/pym/update/update.py
+++ b/pym/update/update.py
@@ -599,7 +599,7 @@ class Update(MethodsInterface):
             else:
                 for root, dirs, files in os.walk(rpath):
                     for f in files:
-                        os.replace(os.path.join(rpath, d), os.path.join(rpath_old, f))
+                        os.replace(os.path.join(rpath, f), os.path.join(rpath_old, f))
                     for d in dirs:
                         shutil.move(os.path.join(rpath, d), os.path.join(rpath_old, d))
                 clearDirectory(rpath)
@@ -607,7 +607,7 @@ class Update(MethodsInterface):
             if p.failed():
                 for root, dirs, files in os.walk(rpath_old):
                     for f in files:
-                        os.replace(os.path.join(rpath_old, d), os.path.join(rpath, f))
+                        os.replace(os.path.join(rpath_old, f), os.path.join(rpath, f))
                     for d in dirs:
                         shutil.move(os.path.join(rpath_old, d), os.path.join(rpath, d))
                 raise UpdateError(