diff --git a/scripts/run.sh b/scripts/run.sh
index 9c19f026..580844ac 100755
--- a/scripts/run.sh
+++ b/scripts/run.sh
@@ -2,5 +2,5 @@
 # Run python interpreter with current dir as search path, and remove all
 # locale and proxy settings.
 # Set PYOPTS for options, for example PYOPTS=-O.
-PYVER=2.5
+PYVER=2.4
 env -u ftp_proxy -u http_proxy -u LANGUAGE -u LC_ALL -u LC_CTYPE LANG=C PYTHONPATH=`pwd` python${PYVER} ${PYOPTS:-} "$@"