diff --git a/delete-old-branches b/delete-old-branches
index f962026..6659374 100755
--- a/delete-old-branches
+++ b/delete-old-branches
@@ -44,8 +44,8 @@ is_pr_open_on_branch() {
     fi
 
     local br=${1}
-    open_prs_branches=$(curl -s -H "Accept: application/vnd.github.v3+json" -H "Authorization: token ${GITHUB_TOKEN}" \
-        "https://api.github.com/repos/${REPO}/pulls" | jq '.[].head.ref' | tr -d '"')
+    open_prs_branches=$(curl -X GET -s -H "Authorization: token ${GITHUB_TOKEN}" \
+        "${BASE_URI}/repos/${REPO}/pulls" | jq '.[].head.ref' | tr -d '"')
 
     for pr_br in $open_prs_branches; do
       if [[ "${pr_br}" == "${br}" ]]; then