diff --git a/setup.py b/setup.py
index 112ceff..b2a9f59 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@ def get_version():
     if os.path.exists(_git):
         rev = get_revision()
         if rev:
-            version = "2.3.%d" % rev
+            version = "2.3.%s" % rev
             with open(__version, 'w') as fd:
                 fd.write('VERSION="%s"'%version)
             return version