diff --git a/posix/clone b/posix/clone
index 156c397..c197f73 100755
--- a/posix/clone
+++ b/posix/clone
@@ -15,22 +15,13 @@ password ${DRONE_NETRC_PASSWORD}
 EOF
 fi
 
-# Either of SSH_KEY or DRONE_SSH_KEY environment variable represents ssh key.
-# DRONE_SSH_KEY variable is introduced to avoid collision with the user provided
-# environment variable which can be same as SSH_KEY
-
-ssh_key=$DRONE_SSH_KEY
-if [[ -z "${ssh_key}" ]]; then
-	ssh_key=$SSH_KEY
-fi
-
 # if the ssh_key environment variable exists, write
 # the ssh key and add the netrc machine to the
 # known hosts file.
 
-if [[ ! -z "${ssh_key}" ]]; then
+if [[ ! -z "${DRONE_SSH_KEY}" ]]; then
 	mkdir /root/.ssh
-	echo -n "$ssh_key" > /root/.ssh/id_rsa
+	echo -n "$DRONE_SSH_KEY" > /root/.ssh/id_rsa
 	chmod 600 /root/.ssh/id_rsa
 
 	touch /root/.ssh/known_hosts