diff --git a/runtests.sh b/runtests.sh
index cabf31c..d44f3b6 100755
--- a/runtests.sh
+++ b/runtests.sh
@@ -39,6 +39,9 @@ function prepare_venv() {
 
 [ "$NOVENV" == "1" ] || prepare_venv || exit 1
 
+# this script is copied by CI, we don't need it
+rm -f env-toolkit
+
 echo "*****************************************"
 echo "*** Cyclomatic complexity measurement ***"
 echo "*****************************************"