diff --git a/scripts/upgrade/upgrade_6.2_6.3.sh b/scripts/upgrade/upgrade_6.2_6.3.sh
index f09d03c..d5951ed 100755
--- a/scripts/upgrade/upgrade_6.2_6.3.sh
+++ b/scripts/upgrade/upgrade_6.2_6.3.sh
@@ -20,6 +20,8 @@ export PYTHONPATH=${INSTALLPATH}/seafile/lib/python2.6/site-packages:${INSTALLPA
 export PYTHONPATH=${INSTALLPATH}/seafile/lib/python2.7/site-packages:${INSTALLPATH}/seafile/lib64/python2.7/site-packages:$PYTHONPATH
 export SEAFILE_LD_LIBRARY_PATH=${INSTALLPATH}/seafile/lib/:${INSTALLPATH}/seafile/lib64:${LD_LIBRARY_PATH}
 
+PYTHON=/usr/lib/seahub/bin/python2.7
+
 prev_version=6.2
 current_version=6.3