diff --git a/cascading-pr.sh b/cascading-pr.sh
index 5ed8f86..2ae8aa3 100755
--- a/cascading-pr.sh
+++ b/cascading-pr.sh
@@ -25,20 +25,24 @@ function repo_curl() {
 }
 
 function exists_branch() {
-    repo_curl ${options[destination_repo]} api_json ${options[destination_api]}/branches/${options[destination_head]} >& /dev/null
+    local direction=$1
+
+    repo_curl ${options[${direction}_repo]} api_json ${options[${direction}_api]}/branches/${options[${direction}_head]} >& /dev/null
 }
 
 function delete_branch() {
-    if ! $(exists_branch) ; then
-	log_info "branch ${options[destination_head]} does not exists"
+    local direction=$1
+
+    if ! $(exists_branch $direction) ; then
+	log_info "branch ${options[${direction}_head]} does not exists"
 	return
     fi
-    repo_curl ${options[destination_repo]} api_json -X DELETE ${options[destination_api]}/branches/${options[destination_head]}
-    log_info "branch ${options[destination_head]} deleted"
+    repo_curl ${options[${direction}_repo]} api_json -X DELETE ${options[${direction}_api]}/branches/${options[${direction}_head]}
+    log_info "branch ${options[${direction}_head]} deleted"
 }
 
-function upsert_branch() {
-    if $(exists_branch) ; then
+function upsert_destination_branch() {
+    if $(exists_branch destination) ; then
 	log_info "branch ${options[destination_head]} already exists"
 	return
     fi
@@ -60,7 +64,7 @@ function pr_destination_body() {
     echo "cascading-pr from ${options[origin_url]}/${options[origin_repo]}/pulls/${options[origin_pr]}"
 }
 
-function upsert_pr() {
+function upsert_destination_pr() {
     url=$(pr_url destination)
     state=$(pr_state destination)
     if test "$url" != "null" -a "$state" = "open"; then
@@ -87,7 +91,7 @@ function close_pr() {
 	log_info "closing $(pr_url ${direction})"
 	local number=$(pr_number $direction)
 	repo_curl ${options[${direction}_repo]} api_json -X PATCH --data '{"state":"closed"}' ${options[${direction}_api]}/issues/$number
-	delete_branch $(pr_head ${direction})
+	delete_branch ${direction}
     else
 	log_info "no open PR found"
     fi
@@ -220,8 +224,8 @@ function run() {
 	open)
 	    log_info "PR is open, update or create the cascade branch and PR"
 	    repo_login ${options[destination_repo]}
-	    upsert_branch
-	    upsert_pr
+	    upsert_destination_branch
+	    upsert_destination_pr
 	    repo_login ${options[origin_repo]}
 	    update
 	    wait_destination_ci $(cat $TMPDIR/destination.sha)