--- migrate/versioning/migrate_repository.py
+++ migrate/versioning/migrate_repository.py
@@ -13,12 +13,12 @@
 
 def usage():
     """Gives usage information."""
-    print """Usage: %(prog)s repository-to-migrate
+    print("""Usage: %(prog)s repository-to-migrate
 
     Upgrade your repository to the new flat format.
 
     NOTE: You should probably make a backup before running this.
-    """ % {'prog': sys.argv[0]}
+    """ % {'prog': sys.argv[0]})
 
     sys.exit(1)