diff --git a/script/cibuild-gh-ost-replica-tests b/script/cibuild-gh-ost-replica-tests
index a1fa646..b11cfa4 100755
--- a/script/cibuild-gh-ost-replica-tests
+++ b/script/cibuild-gh-ost-replica-tests
@@ -4,6 +4,7 @@ set -e
 
 whoami
 
+rm -rf ./gh-ost-ci-env
 [ -d "gh-ost-ci-env" ] || git clone https://github.com/github/gh-ost-ci-env.git
 
 test_mysql_version() {