diff --git a/pisi/install.py b/pisi/install.py
index b9c0e40c..ac06a200 100644
--- a/pisi/install.py
+++ b/pisi/install.py
@@ -14,6 +14,13 @@
 
 # Author:  Eray Ozkural <eray@uludag.org.tr>
 
+
+# for python 2.3 compatibility
+import sys
+ver = sys.version_info
+if ver[0] <= 2 and ver[1] < 4:
+    from sets import Set as set
+
 import os
 
 import gettext