diff --git a/lib/configure.py b/lib/configure.py
index db947b81e3..0096a9151e 100644
--- a/lib/configure.py
+++ b/lib/configure.py
@@ -166,7 +166,7 @@ def checkUpgrade():
             logger.debug('previous = ' + previous)
             if os.path.isdir( previous ):
                 logger.info('Found directory "%s".', previous)
-                copy_tree( previous, cwd, true )
+                copy_tree( previous, cwd, True )
                 logger.info('Content copied to directory "%s".', cwd)
                 return